Fatal error: Uncaught Error: Class 'PHP_CodeSniffer_Exception' not found in C:\wamp\www\mercadopago\vendor\squizlabs\php_codesniffer\CodeSniffer\Standards\PEAR\Sniffs\NamingConventions\ValidVariableNameSniff.php:17 Stack trace: #0 {main} thrown in C:\wamp\www\mercadopago\vendor\squizlabs\php_codesniffer\CodeSniffer\Standards\PEAR\Sniffs\NamingConventions\ValidVariableNameSniff.php on line 17