Hi,
The proxy folder of a module contains the Java Class of the Domain model objects of the module in Studio Pro. These are generated when deploying your app locally. If there is an error in this folder, most of the times this happens when duplicating/renaming the module.
Delete this proxy folder (only the proxy folder!) and deploy your app again and the issue should be gone!
Hope it Helps
Thanks & Regards,
Manikandan K