Application quit shows error in iOS

I have prepare build for iOS and on simulator its works fine. But when I press quit button it shows me following error in xCode.

[35215-screenshot+2014-11-14+09.51.32.png|35215]

On quit button click event I just written

Application.Quit();

Why it is firing error that I can’t able to understand. I just want to close game when user press on quit button. Although I want to mention that I am running my game in simulator not on actual device.
Please help me to solve this problem.

Short version of what the comment links to: remove the quit button. I believe Apple rejects apps for having one anyway.