PHP Error while pulling excel report -

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i following error while trying pull excel report. remember error occurred previously, not sure if increasing php memory fixed it. please suggest.

fatal error: uncaught exception 'phpexcel_exception' message 'worksheet!w529 -> formula error: operator '-' has no operands' in c:\xampp\htdocs\asia\classes\phpexcel\cell.php:307 stack trace: #0 c:\xampp\htdocs\asia\classes\phpexcel\writer\excel5\worksheet.php(460): phpexcel_cell->getcalculatedvalue() #1 c:\xampp\htdocs\asia\classes\phpexcel\writer\excel5.php(194): phpexcel_writer_excel5_worksheet->close() #2 c:\xampp\htdocs\asia\xlsheet.php(201): phpexcel_writer_excel5->save('dailytrack14_13...') #3 {main} thrown in c:\xampp\htdocs\asia\classes\phpexcel\cell.php on line 307


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