Unable to patch action graph - unexpected executable in compile action

Development Getting Started & Setup
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The way I fixed this was:

  1. Shutdown Unreal Engine

  2. Shutdown Visual Studio Code

  3. Delete the following folders in your project directory:
    Binaries
    DerivedDataCache
    Intermediate

  4. Start up Unreal Engine with the project.

  5. It will give you a message about needing to recompile binaries etc (this will take a long time and the computer will appear to be doing nothing).

  6. Eventually the project will open in Unreal Engine

  7. Build it.

After this process I was a back in action.

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