containerURLForSecurityApplicationGroupIdentifier returns nil on iOS Simulator

Question

Context

With iOS8 and extensions Apple introduced the App group containers (more info here).

Problem

We use it through NSFileManager\'s

Answer 1

The Method containerURLForSecurityApplicationGroupIdentifier: works in my Simulator. But if i delete all files in the group folder (in case a user performs a logout in my app) the method returns nil on the next RUN in Xcode 6.1. I tested this with Xcode 6.2 and iOS SDK 8.2 Beta as well but it doesn't work.

The Code runs fine on a real device.

I also tried the above solutions without success.