string(390) "App\Controller\RelationController::addContentAction(): Argument #2 ($content) must be of type Ibexa\Core\Repository\Values\Content\Content, ProxyManagerGeneratedProxy\__PM__\Ibexa\Contracts\Core\Repository\Values\Content\Content\Generated2e059aff67152b1b9af9dc9689b820a6 given, called in /ibexa.ferrowings.pl/vendor/ibexa/core/src/bundle/Core/Fragment/DirectFragmentRenderer.php on line 143"