"Add Documentation" is disabled in Xcode 9.1 (9B55)

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For example:

Add Documentation Disabled

Any ideas?

MacOS High Sierra 10.13.1
Xcode 9.1 9B55

6 Answers

I fixed this by quitting Xcode and deleting all the files in directory ~/Library/Developer/Xcode/DerivedData/.

I had the same issue with Xcode10.1.
All Answers here did not work for me.
I was able to solve this issue only by reinstalling Xcode.

  1. Delete Xcode10.1 and empty trash.
  2. Delete all files in ~/Library/Developer/Xcode/DerivedData/ directory and empty trash.
  3. Restart Mac.
  4. Download and install Xcode10.1.
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