Xcode : */swiftc failed with exit code 11, what can I do?

Question

I downloaded Xcode 7 beta 5, and I tried to compile my project with Xcode 7, and it worked. So, after that, I used Xcode 7 to develop my application, but now, I want to back

Answer 1

What worked for me

1. Delete Application from iPhone or simulator.
2. Clean Project
3. Run again