Fatal error: Uncaught Error: Class "PHPUnit\Framework\Constraint\Constraint" not found in /var/www/html/API_Forum/vendor/api-platform/symfony/Bundle/Test/Constraint/MatchesJsonSchema.php:24 Stack trace: #0 {main} thrown in /var/www/html/API_Forum/vendor/api-platform/symfony/Bundle/Test/Constraint/MatchesJsonSchema.php on line 24