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

Question

For example:

Any ideas?

MacOS High Sierra 10.13.1
Xcode 9.1 9B55

Answer 1

As KellyTheDude mentioned, renaming or moving the Xcode.app will fix the issue on OSX 10.13 (High Sierra) since /usr/libexec/xpccachectl (the preferred solution) does not seem to exist under this version of the OS. To fix quickly:

1. Rename Xcode in the applications folder temporarily.
2. Name it back to Xcode

UPDATE: This fix also works on macOS Mojave (10.14) and Xcode 10

UPDATE: This also fixes the Xcode Source Editor not showing up in System Preferences under Extensions (for Swiftify, etc.)