Fatal error: Uncaught Error: Class "PHP_CodeSniffer\Tests\Standards\AbstractSniffUnitTest" not found in C:\xampp\htdocs\snipe-it\vendor\squizlabs\php_codesniffer\src\Standards\Squiz\Tests\CSS\OpacityUnitTest.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\snipe-it\vendor\squizlabs\php_codesniffer\src\Standards\Squiz\Tests\CSS\OpacityUnitTest.php on line 14