java - Android App Sample App crashed after including project dependency -

i created blank application in android studio having 1 activity. when running without including shared project hello world displayed. when include shared project in app's build.gradle dependencies section:

dependencies {     compile (project(':shared')) } 

when running following error event when not use shared:

unfortunately, testapp has stopped.

08-19 18:45:07.903    1628-1667/? e/backup﹕ [legacybackupaccountmanager] fail legacy transport context.     android.content.pm.packagemanager$namenotfoundexception: application package com.google.android.backup not found             @ android.app.contextimpl.createpackagecontextasuser(contextimpl.java:2172)             @ android.app.contextimpl.createpackagecontext(contextimpl.java:2148)             @ android.content.contextwrapper.createpackagecontext(contextwrapper.java:671)             @ com.google.android.gms.backup.an.<init>(sourcefile:47)             @ com.google.android.gms.backup.backuptransportmigratorservice.f(sourcefile:248)             @ com.google.android.gms.backup.backuptransportmigratorservice.d(sourcefile:31)             @ com.google.android.gms.backup.y.a(sourcefile:97)             @ com.google.android.gms.backup.y.doinbackground(sourcefile:93)             @ android.os.asynctask$2.call(asynctask.java:292)             @ java.util.concurrent.futuretask.run(futuretask.java:237)             @ android.os.asynctask$serialexecutor$1.run(asynctask.java:231)             @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112)             @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:587)             @ java.lang.thread.run(thread.java:818) 08-19 18:45:08.262    1682-1706/? e/sqlitelog﹕ (284) automatic index on assetrefs(dataitems_id) 08-19 18:45:08.419    1645-1713/? e/backup﹕ [legacybackupaccountmanager] fail legacy transport context.     android.content.pm.packagemanager$namenotfoundexception: application package com.google.android.backup not found             @ android.app.contextimpl.createpackagecontextasuser(contextimpl.java:2172)             @ android.app.contextimpl.createpackagecontext(contextimpl.java:2148)             @ android.content.contextwrapper.createpackagecontext(contextwrapper.java:671)             @ com.google.android.gms.backup.an.<init>(sourcefile:47)             @ com.google.android.gms.backup.a.a(sourcefile:66)             @ com.google.android.gms.backup.c.a(sourcefile:40)             @ com.google.android.gms.backup.b.a(sourcefile:69)             @ com.google.android.gms.backup.b.a(sourcefile:40)             @ com.google.android.gms.backup.backupaccountnotifierservice.onhandleintent(sourcefile:76)             @ android.app.intentservice$servicehandler.handlemessage(intentservice.java:65)             @ android.os.handler.dispatchmessage(handler.java:102)             @ android.os.looper.loop(looper.java:135)             @ android.os.handlerthread.run(handlerthread.java:61) 08-19 18:45:10.145    1737-1737/? e/bluetoothadapter﹕ bluetooth binder null 08-19 18:45:11.177    1645-1658/? e/sqlitelog﹕ (283) recovered 6 frames wal file /data/data/com.google.android.gms/databases/playlog.db-wal 08-19 18:45:11.972    1821-1967/? e/sqlitelog﹕ (283) recovered 64 frames wal file /data/user/0/com.android.providers.media/databases/internal.db-wal 08-19 18:45:12.239    1867-1876/? e/strictmode﹕ resource acquired @ attached stack trace never released. see java.io.closeable information on avoiding resource leaks.     java.lang.throwable: explicit termination method 'release' not called             @ dalvik.system.closeguard.open(closeguard.java:184)             @ android.drm.drmmanagerclient.<init>(drmmanagerclient.java:258)             @ com.google.android.mms.pdu.pdupersister.<init>(pdupersister.java:288)             @ com.google.android.mms.pdu.pdupersister.getpdupersister(pdupersister.java:299)             @ com.android.mms.transaction.transactionservice.onnewintent(transactionservice.java:231)             @ com.android.mms.transaction.transactionservice$servicehandler.handlemessage(transactionservice.java:633)             @ android.os.handler.dispatchmessage(handler.java:102)             @ android.os.looper.loop(looper.java:135)             @ android.os.handlerthread.run(handlerthread.java:61) 08-19 18:45:12.482    1821-1967/? e/sqlitelog﹕ (283) recovered 77 frames wal file /data/user/0/com.android.providers.media/databases/external.db-wal 08-19 18:45:12.657    1628-2002/? e/bluetoothadapter﹕ bluetooth binder null 08-19 18:45:12.766    1628-2002/? e/copresgcore﹕ wifimedium: wifi not supported!! 08-19 18:45:12.996    1628-2002/? e/copresgcore﹕ obfuscatedgaiaidlookup: not load obfuscatedgaiaids: /data/data/com.google.android.gms/files/copresence_gaia_id: open failed: enoent (no such file or directory) 08-19 18:45:13.023    1628-2002/? e/copresgcore﹕ couldn't load settings: /data/data/com.google.android.gms/files/copresence_settings: open failed: enoent (no such file or directory) 08-19 18:45:13.592    2035-2035/? e/activitythread﹕ service com.android.email.service.emailbroadcastprocessorservice has leaked serviceconnection com.android.emailcommon.service.serviceproxy$proxyconnection@36784645 bound here     android.app.serviceconnectionleaked: service com.android.email.service.emailbroadcastprocessorservice has leaked serviceconnection com.android.emailcommon.service.serviceproxy$proxyconnection@36784645 bound here             @ android.app.loadedapk$servicedispatcher.<init>(loadedapk.java:1077)             @ android.app.loadedapk.getservicedispatcher(loadedapk.java:971)             @ android.app.contextimpl.bindservicecommon(contextimpl.java:1774)             @ android.app.contextimpl.bindservice(contextimpl.java:1757)             @ android.content.contextwrapper.bindservice(contextwrapper.java:539)             @ com.android.emailcommon.service.serviceproxy.settask(serviceproxy.java:181)             @ com.android.emailcommon.service.serviceproxy.test(serviceproxy.java:224)             @ com.android.email.service.emailserviceutils.isserviceavailable(emailserviceutils.java:160)             @ com.android.email.provider.accountreconciler.reconcileaccountsinternal(accountreconciler.java:171)             @ com.android.email.provider.accountreconciler.reconcileaccounts(accountreconciler.java:115)             @ com.android.email.service.emailbroadcastprocessorservice.reconcileandstartservices(emailbroadcastprocessorservice.java:305)             @ com.android.email.service.emailbroadcastprocessorservice.onbootcompleted(emailbroadcastprocessorservice.java:295)             @ com.android.email.service.emailbroadcastprocessorservice.onhandleintent(emailbroadcastprocessorservice.java:130)             @ android.app.intentservice$servicehandler.handlemessage(intentservice.java:65)             @ android.os.handler.dispatchmessage(handler.java:102)             @ android.os.looper.loop(looper.java:135)             @ android.os.handlerthread.run(handlerthread.java:61) 08-19 18:45:16.818    1849-2106/? e/sqlitelog﹕ (284) automatic index on view_events(_id) 08-19 18:45:28.627    2116-2116/? e/memtrack﹕ couldn't load memtrack module (no such file or directory) 08-19 18:45:28.627    2116-2116/? e/android.os.debug﹕ failed load memtrack module: -2 08-19 18:45:37.446    2169-2169/? e/memtrack﹕ couldn't load memtrack module (no such file or directory) 08-19 18:45:37.446    2169-2169/? e/android.os.debug﹕ failed load memtrack module: -2 08-19 18:45:37.537    2179-2179/? e/androidruntime﹕ fatal exception: main     process: de.majestella, pid: 2179     java.lang.runtimeexception: unable instantiate activity componentinfo{de.majestella/de.majestella.mainactivity}: java.lang.classnotfoundexception: didn't find class "de.majestella.mainactivity" on path: dexpathlist[[zip file "/data/app/de.majestella-2/base.apk"],nativelibrarydirectories=[/vendor/lib, /system/lib]]             @ android.app.activitythread.performlaunchactivity(activitythread.java:2236)             @ android.app.activitythread.handlelaunchactivity(activitythread.java:2390)             @ android.app.activitythread.access$800(activitythread.java:151)             @ android.app.activitythread$h.handlemessage(activitythread.java:1303)             @ android.os.handler.dispatchmessage(handler.java:102)             @ android.os.looper.loop(looper.java:135)             @ android.app.activitythread.main(activitythread.java:5257)             @ java.lang.reflect.method.invoke(native method)             @ java.lang.reflect.method.invoke(method.java:372)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:903)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:698)      caused by: java.lang.classnotfoundexception: didn't find class "de.majestella.mainactivity" on path: dexpathlist[[zip file "/data/app/de.majestella-2/base.apk"],nativelibrarydirectories=[/vendor/lib, /system/lib]]             @ dalvik.system.basedexclassloader.findclass(basedexclassloader.java:56)             @ java.lang.classloader.loadclass(classloader.java:511)             @ java.lang.classloader.loadclass(classloader.java:469)             @ android.app.instrumentation.newactivity(instrumentation.java:1066)             @ android.app.activitythread.performlaunchactivity(activitythread.java:2226)             at android.app.activitythread.handlelaunchactivity(activitythread.java:2390)             at android.app.activitythread.access$800(activitythread.java:151)             at android.app.activitythread$h.handlemessage(activitythread.java:1303)             at android.os.handler.dispatchmessage(handler.java:102)             at android.os.looper.loop(looper.java:135)             at android.app.activitythread.main(activitythread.java:5257)             at java.lang.reflect.method.invoke(native method)             at java.lang.reflect.method.invoke(method.java:372)             at com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:903)             at com.android.internal.os.zygoteinit.main(zygoteinit.java:698)     suppressed: java.lang.classnotfoundexception: de.majestella.mainactivity             @ java.lang.class.classforname(native method)             @ java.lang.bootclassloader.findclass(classloader.java:781)             @ java.lang.bootclassloader.loadclass(classloader.java:841)             @ java.lang.classloader.loadclass(classloader.java:504)             ... 13 more      caused by: java.lang.noclassdeffounderror: class not found using boot class loader; no stack available 08-19 18:45:37.673      920-920/? e/egl_emulation﹕ tid 920: eglcreatesynckhr(1237): error 0x3004 (egl_bad_attribute) 08-19 18:49:32.130    2225-2225/? e/memtrack﹕ couldn't load memtrack module (no such file or directory) 08-19 18:49:32.130    2225-2225/? e/android.os.debug﹕ failed load memtrack module: -2 08-19 18:49:32.445    2237-2237/? e/memtrack﹕ couldn't load memtrack module (no such file or directory) 08-19 18:49:32.445    2237-2237/? e/android.os.debug﹕ failed load memtrack module: -2 08-19 18:49:32.478    2237-2245/? e/art﹕ thread attaching while runtime shutting down: binder_1 08-19 18:49:32.531    2246-2246/? e/androidruntime﹕ fatal exception: main     process: de.majestella, pid: 2246     java.lang.runtimeexception: unable instantiate activity componentinfo{de.majestella/de.majestella.mainactivity}: java.lang.classnotfoundexception: didn't find class "de.majestella.mainactivity" on path: dexpathlist[[zip file "/data/app/de.majestella-2/base.apk"],nativelibrarydirectories=[/vendor/lib, /system/lib]]             @ android.app.activitythread.performlaunchactivity(activitythread.java:2236)             @ android.app.activitythread.handlelaunchactivity(activitythread.java:2390)             @ android.app.activitythread.access$800(activitythread.java:151)             @ android.app.activitythread$h.handlemessage(activitythread.java:1303)             @ android.os.handler.dispatchmessage(handler.java:102)             @ android.os.looper.loop(looper.java:135)             @ android.app.activitythread.main(activitythread.java:5257)             @ java.lang.reflect.method.invoke(native method)             @ java.lang.reflect.method.invoke(method.java:372)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:903)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:698)      caused by: java.lang.classnotfoundexception: didn't find class "de.majestella.mainactivity" on path: dexpathlist[[zip file "/data/app/de.majestella-2/base.apk"],nativelibrarydirectories=[/vendor/lib, /system/lib]]             @ dalvik.system.basedexclassloader.findclass(basedexclassloader.java:56)             @ java.lang.classloader.loadclass(classloader.java:511)             @ java.lang.classloader.loadclass(classloader.java:469)             @ android.app.instrumentation.newactivity(instrumentation.java:1066)             @ android.app.activitythread.performlaunchactivity(activitythread.java:2226)             at android.app.activitythread.handlelaunchactivity(activitythread.java:2390)             at android.app.activitythread.access$800(activitythread.java:151)             at android.app.activitythread$h.handlemessage(activitythread.java:1303)             at android.os.handler.dispatchmessage(handler.java:102)             at android.os.looper.loop(looper.java:135)             at android.app.activitythread.main(activitythread.java:5257)             at java.lang.reflect.method.invoke(native method)             at java.lang.reflect.method.invoke(method.java:372)             at com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:903)             at com.android.internal.os.zygoteinit.main(zygoteinit.java:698)     suppressed: java.lang.classnotfoundexception: de.majestella.mainactivity             @ java.lang.class.classforname(native method)             @ java.lang.bootclassloader.findclass(classloader.java:781)             @ java.lang.bootclassloader.loadclass(classloader.java:841)             @ java.lang.classloader.loadclass(classloader.java:504)             ... 13 more      caused by: java.lang.noclassdeffounderror: class not found using boot class loader; no stack available 08-19 18:49:32.663      920-920/? e/egl_emulation﹕ tid 920: eglcreatesynckhr(1237): error 0x3004 (egl_bad_attribute) 08-19 18:50:38.661      920-920/? e/egl_emulation﹕ tid 920: eglcreatesynckhr(1237): error 0x3004 (egl_bad_attribute) 08-19 18:56:50.296    2275-2275/? e/memtrack﹕ couldn't load memtrack module (no such file or directory) 08-19 18:56:50.296    2275-2275/? e/android.os.debug﹕ failed load memtrack module: -2 08-19 18:56:54.317    2302-2302/? e/memtrack﹕ couldn't load memtrack module (no such file or directory) 08-19 18:56:54.317    2302-2302/? e/android.os.debug﹕ failed load memtrack module: -2 08-19 18:57:42.985    2333-2333/? e/memtrack﹕ couldn't load memtrack module (no such file or directory) 08-19 18:57:42.985    2333-2333/? e/android.os.debug﹕ failed load memtrack module: -2 08-19 18:57:43.000    1218-1250/? e/inputdispatcher﹕ channel 'e559d02 de.majestella/de.majestella.mainactivity (server)' ~ channel unrecoverably broken , disposed! 08-19 18:57:43.026    2333-2343/? e/art﹕ thread attaching while runtime shutting down: binder_2 08-19 18:57:43.363    2346-2346/? e/memtrack﹕ couldn't load memtrack module (no such file or directory) 08-19 18:57:43.363    2346-2346/? e/android.os.debug﹕ failed load memtrack module: -2 08-19 19:00:08.919      920-920/? e/egl_emulation﹕ tid 920: eglcreatesynckhr(1237): error 0x3004 (egl_bad_attribute) 08-19 19:02:55.120    2381-2381/? e/memtrack﹕ couldn't load memtrack module (no such file or directory) 08-19 19:02:55.120    2381-2381/? e/android.os.debug﹕ failed load memtrack module: -2 08-19 19:03:04.755    2407-2407/? e/memtrack﹕ couldn't load memtrack module (no such file or directory) 08-19 19:03:04.755    2407-2407/? e/android.os.debug﹕ failed load memtrack module: -2 08-19 19:03:04.833    2417-2417/? e/androidruntime﹕ fatal exception: main     process: de.majestella, pid: 2417     java.lang.runtimeexception: unable instantiate activity componentinfo{de.majestella/de.majestella.mainactivity}: java.lang.classnotfoundexception: didn't find class "de.majestella.mainactivity" on path: dexpathlist[[zip file "/data/app/de.majestella-2/base.apk"],nativelibrarydirectories=[/vendor/lib, /system/lib]]             @ android.app.activitythread.performlaunchactivity(activitythread.java:2236)             @ android.app.activitythread.handlelaunchactivity(activitythread.java:2390)             @ android.app.activitythread.access$800(activitythread.java:151)             @ android.app.activitythread$h.handlemessage(activitythread.java:1303)             @ android.os.handler.dispatchmessage(handler.java:102)             @ android.os.looper.loop(looper.java:135)             @ android.app.activitythread.main(activitythread.java:5257)             @ java.lang.reflect.method.invoke(native method)             @ java.lang.reflect.method.invoke(method.java:372)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:903)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:698)      caused by: java.lang.classnotfoundexception: didn't find class "de.majestella.mainactivity" on path: dexpathlist[[zip file "/data/app/de.majestella-2/base.apk"],nativelibrarydirectories=[/vendor/lib, /system/lib]]             @ dalvik.system.basedexclassloader.findclass(basedexclassloader.java:56)             @ java.lang.classloader.loadclass(classloader.java:511)             @ java.lang.classloader.loadclass(classloader.java:469)             @ android.app.instrumentation.newactivity(instrumentation.java:1066)             @ android.app.activitythread.performlaunchactivity(activitythread.java:2226)             at android.app.activitythread.handlelaunchactivity(activitythread.java:2390)             at android.app.activitythread.access$800(activitythread.java:151)             at android.app.activitythread$h.handlemessage(activitythread.java:1303)             at android.os.handler.dispatchmessage(handler.java:102)             at android.os.looper.loop(looper.java:135)             at android.app.activitythread.main(activitythread.java:5257)             at java.lang.reflect.method.invoke(native method)             at java.lang.reflect.method.invoke(method.java:372)             at com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:903)             at com.android.internal.os.zygoteinit.main(zygoteinit.java:698)     suppressed: java.lang.classnotfoundexception: de.majestella.mainactivity             @ java.lang.class.classforname(native method)             @ java.lang.bootclassloader.findclass(classloader.java:781)             @ java.lang.bootclassloader.loadclass(classloader.java:841)             @ java.lang.classloader.loadclass(classloader.java:504)             ... 13 more      caused by: java.lang.noclassdeffounderror: class not found using boot class loader; no stack available 08-19 19:03:04.974      920-920/? e/egl_emulation﹕ tid 920: eglcreatesynckhr(1237): error 0x3004 (egl_bad_attribute) 08-19 19:19:43.991    2443-2443/? e/memtrack﹕ couldn't load memtrack module (no such file or directory) 08-19 19:19:43.991    2443-2443/? e/android.os.debug﹕ failed load memtrack module: -2 08-19 19:19:44.011    2443-2453/? e/art﹕ thread attaching while runtime shutting down: binder_2 08-19 19:19:44.312    2456-2456/? e/memtrack﹕ couldn't load memtrack module (no such file or directory) 08-19 19:19:44.312    2456-2456/? e/android.os.debug﹕ failed load memtrack module: -2 08-19 19:19:44.352    2456-2464/? e/art﹕ thread attaching while runtime shutting down: binder_1 08-19 19:19:44.396    2465-2465/? e/androidruntime﹕ fatal exception: main     process: de.majestella, pid: 2465     java.lang.runtimeexception: unable instantiate activity componentinfo{de.majestella/de.majestella.mainactivity}: java.lang.classnotfoundexception: didn't find class "de.majestella.mainactivity" on path: dexpathlist[[zip file "/data/app/de.majestella-2/base.apk"],nativelibrarydirectories=[/vendor/lib, /system/lib]]             @ android.app.activitythread.performlaunchactivity(activitythread.java:2236)             @ android.app.activitythread.handlelaunchactivity(activitythread.java:2390)             @ android.app.activitythread.access$800(activitythread.java:151)             @ android.app.activitythread$h.handlemessage(activitythread.java:1303)             @ android.os.handler.dispatchmessage(handler.java:102)             @ android.os.looper.loop(looper.java:135)             @ android.app.activitythread.main(activitythread.java:5257)             @ java.lang.reflect.method.invoke(native method)             @ java.lang.reflect.method.invoke(method.java:372)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:903)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:698)      caused by: java.lang.classnotfoundexception: didn't find class "de.majestella.mainactivity" on path: dexpathlist[[zip file "/data/app/de.majestella-2/base.apk"],nativelibrarydirectories=[/vendor/lib, /system/lib]]             @ dalvik.system.basedexclassloader.findclass(basedexclassloader.java:56)             @ java.lang.classloader.loadclass(classloader.java:511)             @ java.lang.classloader.loadclass(classloader.java:469)             @ android.app.instrumentation.newactivity(instrumentation.java:1066)             @ android.app.activitythread.performlaunchactivity(activitythread.java:2226)             at android.app.activitythread.handlelaunchactivity(activitythread.java:2390)             at android.app.activitythread.access$800(activitythread.java:151)             at android.app.activitythread$h.handlemessage(activitythread.java:1303)             at android.os.handler.dispatchmessage(handler.java:102)             at android.os.looper.loop(looper.java:135)             at android.app.activitythread.main(activitythread.java:5257)             at java.lang.reflect.method.invoke(native method)             at java.lang.reflect.method.invoke(method.java:372)             at com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:903)             at com.android.internal.os.zygoteinit.main(zygoteinit.java:698)     suppressed: java.lang.classnotfoundexception: de.majestella.mainactivity             @ java.lang.class.classforname(native method)             @ java.lang.bootclassloader.findclass(classloader.java:781)             @ java.lang.bootclassloader.loadclass(classloader.java:841)             @ java.lang.classloader.loadclass(classloader.java:504)             ... 13 more      caused by: java.lang.noclassdeffounderror: class not found using boot class loader; no stack available 08-19 19:19:44.524      920-920/? e/egl_emulation﹕ tid 920: eglcreatesynckhr(1237): error 0x3004 (egl_bad_attribute) 08-19 19:20:30.632    2485-2485/? e/memtrack﹕ couldn't load memtrack module (no such file or directory) 08-19 19:20:30.632    2485-2485/? e/android.os.debug﹕ failed load memtrack module: -2 08-19 19:20:30.658    2485-2494/? e/art﹕ thread attaching while runtime shutting down: binder_1 08-19 19:20:30.953    2497-2497/? e/memtrack﹕ couldn't load memtrack module (no such file or directory) 08-19 19:20:30.953    2497-2497/? e/android.os.debug﹕ failed load memtrack module: -2 08-19 19:20:31.001    2497-2505/? e/art﹕ thread attaching while runtime shutting down: binder_1 08-19 19:20:31.026    2506-2506/? e/androidruntime﹕ fatal exception: main     process: de.majestella, pid: 2506     java.lang.runtimeexception: unable instantiate activity componentinfo{de.majestella/de.majestella.mainactivity}: java.lang.classnotfoundexception: didn't find class "de.majestella.mainactivity" on path: dexpathlist[[zip file "/data/app/de.majestella-2/base.apk"],nativelibrarydirectories=[/vendor/lib, /system/lib]]             @ android.app.activitythread.performlaunchactivity(activitythread.java:2236)             @ android.app.activitythread.handlelaunchactivity(activitythread.java:2390)             @ android.app.activitythread.access$800(activitythread.java:151)             @ android.app.activitythread$h.handlemessage(activitythread.java:1303)             @ android.os.handler.dispatchmessage(handler.java:102)             @ android.os.looper.loop(looper.java:135)             @ android.app.activitythread.main(activitythread.java:5257)             @ java.lang.reflect.method.invoke(native method)             @ java.lang.reflect.method.invoke(method.java:372)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:903)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:698)      caused by: java.lang.classnotfoundexception: didn't find class "de.majestella.mainactivity" on path: dexpathlist[[zip file "/data/app/de.majestella-2/base.apk"],nativelibrarydirectories=[/vendor/lib, /system/lib]]             @ dalvik.system.basedexclassloader.findclass(basedexclassloader.java:56)             @ java.lang.classloader.loadclass(classloader.java:511)             @ java.lang.classloader.loadclass(classloader.java:469)             @ android.app.instrumentation.newactivity(instrumentation.java:1066)             @ android.app.activitythread.performlaunchactivity(activitythread.java:2226)             at android.app.activitythread.handlelaunchactivity(activitythread.java:2390)             at android.app.activitythread.access$800(activitythread.java:151)             at android.app.activitythread$h.handlemessage(activitythread.java:1303)             at android.os.handler.dispatchmessage(handler.java:102)             at android.os.looper.loop(looper.java:135)             at android.app.activitythread.main(activitythread.java:5257)             at java.lang.reflect.method.invoke(native method)             at java.lang.reflect.method.invoke(method.java:372)             at com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:903)             at com.android.internal.os.zygoteinit.main(zygoteinit.java:698)     suppressed: java.lang.classnotfoundexception: de.majestella.mainactivity             @ java.lang.class.classforname(native method)             @ java.lang.bootclassloader.findclass(classloader.java:781)             @ java.lang.bootclassloader.loadclass(classloader.java:841)             @ java.lang.classloader.loadclass(classloader.java:504)             ... 13 more      caused by: java.lang.noclassdeffounderror: class not found using boot class loader; no stack available 08-19 19:20:31.158      920-920/? e/egl_emulation﹕ tid 920: eglcreatesynckhr(1237): error 0x3004 (egl_bad_attribute) 

what causes app crash?

put same version android support library in project , library projects included , clean build.