Xcode compiles my App, but can't run it in the simulator

Question

when i compile my app, Xcode just says \"Attaching to Projectname...\" and gets stuck there. The debugger just prints this out:

error: failed to attac

Answer 1

I had similar issues when i installed XCode 4.5 on OS X Mountain Lion. I searched a while and tried some fixes but what finally solved the problem was adding "127.0.0.1 localhost" to my hosts file (/etc/hosts).

Here is what i have done:

Open a terminal shell with cmd+space > terminal
type in "cd /etc"
type in "sudo nano hosts"
type in your root password
add "127.0.0.1 localhost"
save with ctrl+o > return
close with ctrl+x
log out and log in again or restart