Hi everyone! I installed the engine from source today and kept running into issues with my C code. The project would build properly in the editor and within Visual Studio, however the most important part of my code so far is a BTTask that updates the AI’s navpoints and no matter how times I’ve rebuilt the project and the engine (even tried the binary version just as a sanity check) I would still run into the “cannot access .generated.h” errors within Visual Studio despite everything working fine.

Does anyone have a fix while Epic finds a solution or should I go back to 4.19?

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UPDATE: So 4.20.2 has been released and was expected to fix the intellisense issue, it has, but to a limited extent, at least for me. After recompiling/building the project, my pre-existing C is active and working, however attempting to create a new class prints a massive error list, again about the .generated.h files. I can only hope that the next update can fix this for good, but for anyone else, I suggest rolling back to an earlier version for the time being. Here is a link to the Unreal Issues page listing the new version.

Link to pastebin of project compiler log

The highlighted AI flickers back and forth between it's two nav points that are selected via a Actor Component

Here the output log is saying that my Blackboard key cannot be found

And here is the mountain of errors I get within Visual Studio despite everything working in the Editor

Compiler errors

Compiler errors

EDIT: Add screenshots to help explain the issue

EDIT #2: Add pastebin with compiler log

EDIT #3: As of 4.20.3, this issue has been solved.