Fatal error: Uncaught PhpOffice\PhpSpreadsheet\Exception: Invalid cell coordinate A-1 in /var/www/html/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Cell/Coordinate.php:49 Stack trace: #0 /var/www/html/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Cell/Coordinate.php(61): PhpOffice\PhpSpreadsheet\Cell\Coordinate::coordinateFromString() #1 /var/www/html/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Worksheet/Worksheet.php(1286): PhpOffice\PhpSpreadsheet\Cell\Coordinate::indexesFromString() #2 /var/www/html/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Worksheet/Worksheet.php(1200): PhpOffice\PhpSpreadsheet\Worksheet\Worksheet->createNewCell() #3 /var/www/html/xlsu.php(181): PhpOffice\PhpSpreadsheet\Worksheet\Worksheet->getCell() #4 /var/www/html/genrecipedev.php(147): xlsu->getCellValueByXY() #5 {main} thrown in /var/www/html/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Cell/Coordinate.php on line 49