Warning: fopen(hello world.xlsx): Failed to open stream: Permission denied in /var/www/erp/office/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/BaseWriter.php on line 123

Fatal error: Uncaught PhpOffice\PhpSpreadsheet\Writer\Exception: Could not open file "hello world.xlsx" for writing. in /var/www/erp/office/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/BaseWriter.php:125 Stack trace: #0 /var/www/erp/office/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/Xlsx.php(539): PhpOffice\PhpSpreadsheet\Writer\BaseWriter->openFileHandle() #1 /var/www/erp/office/prueba.php(13): PhpOffice\PhpSpreadsheet\Writer\Xlsx->save() #2 {main} thrown in /var/www/erp/office/vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Writer/BaseWriter.php on line 125