Fatal error: Uncaught Error: Interface "Composer\Semver\Constraint\ConstraintInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/composer/semver/src/Constraint/MultiConstraint.php:17 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/composer/semver/src/Constraint/MultiConstraint.php on line 17