Error while running the apps llvm-g++-4.2 failed with exit code 1

when i run my app it gives the error like this.

Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/llvm开发者_运维技巧-g++-4.2 failed with exit code 1

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This happened to me because I had a device chosen instead of a simulator. Try picking a specific device or specific simulator. If that doesn't work, try editing your scheme to make sure that the build configuration scheme (like, say, simulator) matches up the chosen device or simulator.