How to catch correctly failures in the published application?

The application has already been published, but in the aytyuns analytics of the application in the column failures show failures in the amount of a quarter of all sessions available. They advised to connect the factories through the application on the poppy, such as it will set everything up, but everything hangs on me. Hooked up the flories, the logs of my events are coming. And error logs do not know how to properly embed. Inserted code with error logs such as in the manual, on the activation buttons, on the screens. But it comes just the number of screen openings or buttons, not the crashes themselves ... help, how to catch ??? thank

Finally coped with the fabric, connected. By clicking on one button gives crashes. Help now to deal with the panel, what and why ...?

Raw Crashed: com.apple.main-thread

0 GuyFit 0x10686db11 - [Crashlytics crash] + 4

1 GuyFit 0x106777beb ProgressViewController.closeButton2 (UIButton) -> () (ProgressViewController.swift: 40)

2 GuyFit 0x106777d1a @objc ProgressViewController.closeButton2 (UIButton) -> () (ProgressViewController.swift)

3 UIKit 0x108ca6a8d - [UIApplication sendAction: to: from: forEvent:] + 92

4 UIKit 0x108e19e67 - [UIControl sendAction: to: forEvent:] + 67

5 UIKit 0x108e1a143 - [UIControl _sendActionsForEvents: withEvent:] + 327

6 UIKit 0x108e19263 - [UIControl touchesEnded: withEvent:] + 601

7 UIKit 0x108d1999f - [UIWindow _sendTouchesForEvent:] + 835

8 UIKit 0x108d1a6d4 - [UIWindow sendEvent:] + 865

9 UIKit 0x108cc5dc6 - [UIApplication sendEvent:] + 263

10 UIKit 0x108c9f553 _UIApplicationHandleEventQueue + 6660

11 CoreFoundation 0x107f0b301 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17

12 CoreFoundation 0x107f0122c __CFRunLoopDoSources0 + 556

13 CoreFoundation 0x107f006e3 __CFRunLoopRun + 867

14 CoreFoundation 0x107f000f8 CFRunLoopRunSpecific + 488

15 GraphicsServices 0x10cdc6ad2 GSEventRunModal + 161 16 UIKit 0x108ca4f09 UIApplicationMain + 171

17 GuyFit 0x10681b372 main (AppDelegate.swift: 15)

18 libdyld.dylib 0x10acad92d start + 1

But the action code of the button itself

@IBAction func closeButton2(sender: UIButton) { self.dismissViewControllerAnimated(true, completion: nil) Crashlytics.sharedInstance().crash() }