I keep running into repeat errors and decided to document them since they're generally easy to solve but I keep forgetting them.
- Close the project
- Delete the Binaries and Intermediate folders
- Right-click on the .uproject file
- Click "Generate Visual Studio project files" (if using windows11 first click "Show more options")
- Open .uproject file and rebuild it
This usually means that there's a declaration in the .h file but no definition in the .cpp file