Fatal error: Uncaught Error: Class "PHP_CodeSniffer\Sniffs\AbstractVariableSniff" not found in /var/www/html/upload/PhpSpreadsheet-master/vendor/squizlabs/php_codesniffer/src/Standards/PSR2/Sniffs/Classes/PropertyDeclarationSniff.php:17 Stack trace: #0 {main} thrown in /var/www/html/upload/PhpSpreadsheet-master/vendor/squizlabs/php_codesniffer/src/Standards/PSR2/Sniffs/Classes/PropertyDeclarationSniff.php on line 17