Error Disk I/O in Quick Help Inspector Xcode9

Question

I have been using Xcode recently when I noticed that the Quick Help tab wasn't showing what is used to show, it was just displaying

Error
Domain=com.apple.DNTDocumentationSupport Code=0 "disk I/O error" UserInfo=
{NSLocalizedDescription=disk I/O error}

I looked up how to fix it, but I got no results.

Does anyone know how to fix this?

Answer 1

I've been facing this issue the past hour or so and the only fix I've found is to restart Xcode. Will report back if it comes back.