Blueprints that inherit from c++ class brake on startup project.

Development Programming & Scripting Blueprint
1

Every time I close and open my project the blueprints that I have that inherit from my C++ classes break.
These are the warnings that I have when opening the project:

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And if i try to open the blueprint a message appears saying that “the blueprint could not be opened because it derives from an invalid class”. The source code is still there tho. Am I missing some kind of configuration when working with c++ and blueprints?

2

You need to run your project from your IDE and best to turn off live coding. It is very fragile and tends to break projects.