Notice: Use of undefined constant PHPEXCEL_ROOT - assumed 'PHPEXCEL_ROOT' in /opt/lampp/htdocs/ims-pharmacy-rest-apis/Excel/Classes/PHPExcel/Shared/trend/trendClass.php on line 3

Warning: require_once(PHPEXCEL_ROOTPHPExcel/Shared/trend/linearBestFitClass.php): failed to open stream: No such file or directory in /opt/lampp/htdocs/ims-pharmacy-rest-apis/Excel/Classes/PHPExcel/Shared/trend/trendClass.php on line 3

Fatal error: require_once(): Failed opening required 'PHPEXCEL_ROOTPHPExcel/Shared/trend/linearBestFitClass.php' (include_path='.:/opt/lampp/lib/php') in /opt/lampp/htdocs/ims-pharmacy-rest-apis/Excel/Classes/PHPExcel/Shared/trend/trendClass.php on line 3