how can i fix this error? building 5.3 from source

Development Programming & Scripting C++
4

To quote Kein from Unreal Slackers,

dont build AutoRTFMTests
remove it from the generated projects or build stuff manually if you use BuildGraph edit the install config/preset

By “remove”, pretty sure he means literally delete the project from your hard disk. Even if you just remove it from the project/solution, it will still build because of the the UE Build Tool.