Fatal error: Uncaught Error: Interface "PHP_CodeSniffer\Sniffs\Sniff" not found in /var/www/html/upload/PhpSpreadsheet-master/vendor/squizlabs/php_codesniffer/src/Standards/MySource/Sniffs/PHP/AjaxNullComparisonSniff.php:20 Stack trace: #0 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/vendor/squizlabs/php_codesniffer/src/Standards/MySource/Sniffs/PHP/AjaxNullComparisonSniff.php on line 20