Fatal error: Uncaught Error: Interface "pvc\interfaces\struct\tree\node\TreenodeCollectionInterface" not found in I:\www\pvcValidator\vendor\pvc\struct\src\tree\node\TreenodeCollection.php:17 Stack trace: #0 {main} thrown in I:\www\pvcValidator\vendor\pvc\struct\src\tree\node\TreenodeCollection.php on line 17