Error: The model element was saved with unparsable source code and cannot be used. Please edit the element in Visual Studio to fix the errors: (CUS)  K:\AosService\PackagesLocalDirectory\bin\XppSource\\.xpp
Possible reason: Sometimes when we rename the object name in code and manually rename the object from Solution explorer, respective metadata still pointing to old names.
This issue doesn’t fix even after DB synch and Model build. The only solution I can find for this issue is by deleting the object and create a new one. Yes, delete the object and create a new one with same code and name. This should fix this error.
Let me know if you found some other fix for the same.