Failed to instantiate the default view controller for UIMainStoryboardFile ‘Main‘ - perhaps the designated entry point is not set?
这是因为给你的StoryBoard没有设置默认显示的controller，
解决方法：
ios常见错误之 Failed to instantiate the default view controller for UIMainStoryboardFile 'Main' - perhaps the designated entry point is not set?
原文：http://www.cnblogs.com/xuan52rock/p/5126581.html
