iOS App crashes after restoring simulator

Before my problem

I was creating an app for iPhone and, after taking my first snapshot, when I ran it on the simulator the storyboard changes in any view where not shown, but all the code changes were applied correctly. I don't know how to solve it but now I have a worse problem. In order to fix the "storyboard changes update" thing I restarted the simulator.

My problem

Now, when I launch the app I get the SIGABRT error.

What I did

I have already restarted the computer, the simulator and Xcode. I also did the Clean thing [cmd + shift + K] and the Clean Build Folder thing [option + cmd + shift + K]. I did all together.

Not working already.

Sometimes I start Xcode and the run button is greyed out but still works.

Some not valid solution

I restored the previous files in the ~/Library/Application Support/iPhone Simulator/6.0/Applications and the application worked again (Storyboard changes not updating, of course) but I want my simulator restored, not some trick.

Note: The old app folder in the simulator was 984E5409-2F65-4560-8AE3-59CDEAC3F314 The new one has a different name, but I don't know if this is the cause.

Thank you very much.