Cannot debug Swift module/framework embedded in Objective-C app

Question

Alternative titles (to aid searching)

• Cannot debug Swift 2.3 framework linked to an Objective-C app in Xcode 8
• error in auto-import: f

Answer 1

For me it was just as simple as it was painful and time consuming:

import SDWebImage was the PROBLEM, because one of the frameworks had the SDWebImage already packed in it(and I couldn't see it), and that framework happened to be Objective-C, and the app was Swift. I also added the SDWebImage to the project, because I use it in the classes I write, and that what created the mess the Xcode debugger couldn't deal with. So basically, make sure you don't have ANYTHING duplicated in ANY way, I'd check for common things like SDWebImage for example.