Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/dyld_sim is not owned by root.

sudo chown -R root /Applications/Xcode6.1.1.app/

这里把这个

/Applications/Xcode6.1.1.app/
替换成你xocde据在的位置
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