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iOS simulator运行程序出现问题：
An error was encountered while running (Domain = FBSOpenApplicationErrorDomain, Code = 4)
解决方案：（重启模拟器）
iOS Simulator----> Reset Contents and Settings ----> Reset
An error was encountered while running (Domain = FBSOpenApplicationErrorDomain, Code = 4)
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原文地址：http://www.cnblogs.com/Jianpusen/p/4298399.html
