Fatal error: Uncaught Error: Class 'PHP_CodeSniffer_Exception' not found in C:\wamp\www\mercadopago\vendor\squizlabs\php_codesniffer\CodeSniffer\Standards\AbstractPatternSniff.php:18 Stack trace: #0 {main} thrown in C:\wamp\www\mercadopago\vendor\squizlabs\php_codesniffer\CodeSniffer\Standards\AbstractPatternSniff.php on line 18