原因分析：在StoryBoard中没有一个view controller设置了Initial Scene。
解决方案：在Storyboard中，选择一个view conroller作为story board的第一启动界面
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- ios常见错误之 Failed to instantiate the default view controller for UIMainStoryboardFile 'Main' - perhaps the designated entry point is not set?
- 报错：Failed to instantiate the default view controller for UIMainStoryboardFile 'MainStoryboard' - perhaps the designated entry point is not set?
- ios：Failed to instantiate the default view controller for UIMainStoryboardFile 'Main' - perhaps the designated entry point is not set?