Getting dyld_fatal_error after updating to Xcode 6 beta 4 using swift

Question

I just recently downloaded Xcode 6 beta 4, and my swift project compiles with no errors but before it gets to my code I get a dyld_fatal_error just above start in the call s

Answer 1

Cleaning, restarting, deleting etc didn't work for me.

I have a project containing another project. When I ran the project on iOS 7 and the contained project was accessed in code, the app stopped at the line below:

After many days, I saw that the deployment target for the container project was 7.0 (as can be seen below).

The contained project on the other hand, had a deployment target of 8.1 (as can be seen below).

Changing the deployment target of the contained project to 7.0 solved my problem!

The project was working fine on iOS 8 devices.