Fatal error: Uncaught Error: Interface "PHP_CodeSniffer\Sniffs\Sniff" not found in /var/www/html/upload/PhpSpreadsheet-master/vendor/squizlabs/php_codesniffer/src/Standards/PSR2/Sniffs/Namespaces/NamespaceDeclarationSniff.php:16 Stack trace: #0 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/vendor/squizlabs/php_codesniffer/src/Standards/PSR2/Sniffs/Namespaces/NamespaceDeclarationSniff.php on line 16