gcc errorfor cocos2d.

[phienex]

When I run the project, I got one error:
ld: duplicate symbol _defaultCapacityin /Users/asfgasiyf/Desktop/pacMan/build/pacMan.build/Debug-iphonesimulator/.../libcocos2d libraries.a(AtlasSpriteManager.o) and /Users/asfgasiyf/Desktop/pacMan/build/pacMan.build/Debug-iphonesimulator/pacMan.build/Objects-normal/i386/CCSpriteBatchNode.o

command/developer/platform/iphoneSimulator.platform/developer/usr/bin/gcc-4.2 failed with exit code 1....



I think the problem may be defaultCapacity..but I really don't know how can I solving this problem? Would anyone help me ?Perhaps give me some instructions how to do...thank you very much...