Xcode 11.5 Rename Refactor failed when trying to rename variable

Question

When I try to re-name any variable, Xcode give me the following error:

I have tried restarting Xcode but the same thing happens. Any ideas how to fix?

Answer 1

I just had this issue with Xcode 11.6 and I solved it like this:

1. Close Xcode
2. Delete all contents of the DerivedData folder (located in ~/Library/Developer/Xcode/DerivedData)

And thats it! When I reopened Xcode it let me use the rename feature.

Answer 2

My experience is that this due to Xcode's (very poor) git integration. When I turn off git integration, the rename works fine.