node.js - ebay api using nodeJs gives error "Unable to create xml stream reader for JSON: payload format incorrect or payload is empty" -

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i trying list product keyword using ebay api maintained here

using following code

var params = {};  params.keywords = ["canon"]; params.outputselector = [ 'aspecthistogram' ];  params['paginationinput.entriesperpage'] = 10;   var filters = {};  filters.itemfilter = [     new ebay.itemfilter("freeshippingonly", true) ];  filters.domainfilter = [     new ebay.itemfilter("domainname", "digital_cameras") ];   ebay.ebayapigetrequest({         servicename: 'findingservice',         optype: 'finditemsbykeywords',         appid: '*********************',      // fill in own app key, 1 here: https://publisher.ebaypartnernetwork.com/publishertoolsapi         params: params,         filters: filters,         parser: ebay.parseitemsfromresponse    // (default)     },     // gets items in merged array     function itemscallback(error, items) {         if (error) throw error;          console.log('found', items.length, 'items');          (var = 0; < items.length; i++) {             console.log('- ' + items[i].title);         }     } );

which throws following error when called

error: bad response status code 500  {   "errormessage":[{   "error":[{"errorid":["5006"],   "domain":["coreruntime"],   "severity":["error"],   "category":["system"],   "message":["unable create xml stream reader json: payload format incorrect or payload empty"],   "subdomain":["comm_recv"],   "parameter":[{"@name":"param1","__value__":"json"}]}] }] }

show code of api import. may problem there... try 

var ebay = require('ebay-api');

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