Fatal error: Uncaught Error: Class "PHP_CodeSniffer\Tokenizers\Tokenizer" not found in /var/www/html/upload/PhpSpreadsheet-master/vendor/squizlabs/php_codesniffer/src/Tokenizers/JS.php:16 Stack trace: #0 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/vendor/squizlabs/php_codesniffer/src/Tokenizers/JS.php on line 16