Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestSuite" not found in /var/www/html/upload/PhpSpreadsheet-master/vendor/squizlabs/php_codesniffer/tests/TestSuite.php:15 Stack trace: #0 /var/www/html/upload/PhpSpreadsheet-master/vendor/squizlabs/php_codesniffer/tests/AllTests.php(29): include_once() #1 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/vendor/squizlabs/php_codesniffer/tests/TestSuite.php on line 15