error: Unable to resolve build file: XCBCore.BuildFile

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For XCode 10 Beta: Problem occurs when I have two workspaces open that share the same project directories. Solution was

Short version

  1. Shut down all but one workspaces
  2. exit XCode and reopen XCode
  3. XCode > Product > Clean Build Folder

Longer version

  1. Shut down all but one workspace
  2. XCode > Preferences > Locations > Derived Data > goto directory ~/Library/Developer/Xcode/DerivedData
  3. Clear out subdirectories from DerivedData
  4. exit XCode and reopen XCode
  5. XCode > Product > Clean Build Folder

Thanks to @aferriss answer for the clue.

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