Could not be compiled. Try rebuilding from source manually

I had a similar situation on Mac OS, I resolved it by doing the following steps:

  • Delete the Intermediate directory of my project.
  • Right click on the uproject, click on Services then Generate XCode Project.

This will create the XCode project, you can then open it and build the project or re-launch Unreal Engine and open the project, it will ask you to build, click yes and it will build the project for you.

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