Xcode 8 - Missing Files warnings

Question

Ever since upgrading to Xcode 8 using Swift 2.3 I have several missing files warnings. They are all related to pods that I am using.

The files that are missing are

Answer 1

I solve the problem simply by this:

1. Add the culprit to the project

2. Remove the reference

This cleans the internal state of XCode and the message goes away.