Quartz error

I am new to xcode, i just followed the project of QCDemo. But when i click "run", it occurs the error:

 

CompileXIB QCDemo/en.lproj/MainMenu.xib

    cd "/Users/lyj/Documents/XCode File/QCDemo"

    setenv XCODE_DEVELOPER_USR_PATH /Applications/Xcode.app/Contents/Developer/usr/bin/..

    /Applications/Xcode.app/Contents/Developer/usr/bin/ibtool --errors --warnings --notices --output-format human-readable-text --compile /Users/lyj/Library/Developer/Xcode/DerivedData/QCDemo-cxqiwvszgawopadhqixraqlqb gyg/Build/Products/Debug/QCDemo.app/Contents/Resources/en.lproj/MainMenu.nib "/Users/lyj/Documents/XCode File/QCDemo/QCDemo/en.lproj/MainMenu.xib" --sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/ SDKs/MacOSX10.8.sdk

 

Command /Applications/Xcode.app/Contents/Developer/usr/bin/ibtool failed with exit code 255

 

 

I don't know how to solve it. The only thing i know is that the error doesn't exist only when i delete the quartz.

 

If you know the methods to solve this ,please help me.

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