added unit testing target to xcode - failed to import bridging header won't go away

I added a new Test target to my XCode project. My project has Swift code and Objective-C code, and has a bridging header. Upon either adding the bridging header to UnitTesting's build settings, or doing import MyTarget, I'm getting the error:

failed to import bridging header

I've tried:

• Adding the bridging header to project, unit testing and main target's build settings.


• Changing defines modules to Yes.


• Moving the bridging header file to the root folder.

I've also tried making a sample project, which built and worked fine. Taking everything I have over into a clean new project isn't an option at this point.