warning: Swift error in module. Debug info from this module will be unavailable in the debugger

Question

I have no debugging values in my console for my swift + obj-c app, and I get a really unhelpful message that explains why the debugger isn't working: "warning: Swift error in module XXX.". XXX is the name of my module, not a 3rd party that I include.

My app has been around since before Swift. I used the bridging header to start using Swift, and I recently used the Xcode tool to migrate all the Swift 2 files to Swift 3. (but I still have obj-c legacy in there). I use cocoapods, which may be contributing to the problem.

(lldb) po self
warning: Swift error in module XXX.
Debug info from this module will be unavailable in the debugger.

I tried following the second answer to this post and a couple others I have found that suggest the same thing: remove duplicate imports.

I tried removing duplicate imports from my swift project. In fact if I run find . -name "*swift" | xargs grep "import" I get no results. So I went to the extreme of removing all imports from all of my swift files (and commenting out code to get it to compile) just to see if I can get my debugger to come back.

So...

• Is there another solution to this problem?
• Is there a way to get a more detailed error message?
• Is it a problem to have duplicate headers in the my bridging header? For example, a lot of my obj-c files import UIKit, and I include a few of those files in the bridging header.

Answer 1

Just now I have encountered this problem. This is my solution:

If you import 3rd repo by Cocoapods, and the repo is written by Objective-C, you need to import it by this way:

// System 
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

// Directly add - Objective-C
#import "EaseUI.h"

// Cocoapods - Objcetive-C
@import MJRefresh;

You can refer to this issue in Github and this question.