Xcode 9.1 Refactoring not available

Question

The refactoring menu in Xcode 9.1 is completely greyed out. I wanted to extract a method from existing swift code and got the following screen:

Do I have to enabled something special to get access to the new refactoring features?

Answer 1

Try cleaning your Xcode. Also try clearing out derived data and restart Xcode.

Clean Build --> (Command-Option-Shift-K)
Delete DerivedData folder in ~/Library/Developer/Xcode/DerivedData

Answer 2

Refactor option hides if you select version editor.
Thanks @paul