Fatal error: Uncaught PhpOffice\PhpSpreadsheet\Exception: Invalid character found in sheet title in C:\Apache24\htdocs\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Worksheet\Worksheet.php:463 Stack trace: #0 C:\Apache24\htdocs\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Worksheet\Worksheet.php(850): PhpOffice\PhpSpreadsheet\Worksheet\Worksheet::checkSheetTitle(NULL) #1 C:\Apache24\htdocs\liberaXLSXprovider.php(24): PhpOffice\PhpSpreadsheet\Worksheet\Worksheet->setTitle(NULL) #2 {main} thrown in C:\Apache24\htdocs\vendor\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Worksheet\Worksheet.php on line 463