Fatal error: Uncaught Exception: Invalid character found in sheet title in C:\Apache24\htdocs\PortalUIS_bkp\excel\Spreadsheet\Excel\Classes\PHPExcel\Worksheet.php:401 Stack trace: #0 C:\Apache24\htdocs\PortalUIS_bkp\excel\Spreadsheet\Excel\Classes\PHPExcel\Worksheet.php(657): PHPExcel_Worksheet::_checkSheetTitle() #1 C:\Apache24\htdocs\PortalUIS_bkp\excel\hojaExcel.php(95): PHPExcel_Worksheet->setTitle() #2 C:\Apache24\htdocs\PortalUIS_bkp\excel\excel.php(24): include('C:\\Apache24\\htd...') #3 {main} thrown in C:\Apache24\htdocs\PortalUIS_bkp\excel\Spreadsheet\Excel\Classes\PHPExcel\Worksheet.php on line 401