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Crash! I will upload the files.

The said crash occurs when i make a 2nd layer (I am making old doorknobs) and try to add or remove anything from 2nd layer it crashes play engine. here are the files https:/drive.google.com/file/d/11c0Uef8vE-eZsxJaY2iXWkbOuB6ZoqWT/view?usp=sharing