这个是什么错误?

xcode 6.3 + iosOpenDev编译时候报错
iphoneos/TestHook.dylib with ldid… xcodebuild: error: SDK “/Applications/Xcode6.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.3.sdk” cannot be located.
codesign_allocate: error: unable to find utility “codesign_allocate”, not a developer tool or in PATH
ldid/ldid.cpp(989): _assert(WEXITSTATUS(status) == 0); errno=0
Failed.