Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/devmecseminars/public_html/mec/vendor/symfony/validator/Test/ConstraintValidatorTestCase.php:39 Stack trace: #0 {main} thrown in /home/devmecseminars/public_html/mec/vendor/symfony/validator/Test/ConstraintValidatorTestCase.php on line 39