Issue in adding Three20 to Unity

Hi All

I have issu in adding Three20 to Unity project. I want to use Three20 with Unity project. When I add Three20 project to Unity and it through’s exception -[TTURLRequestQueue performSelector:withObject:withObject:withObject:]

From forums I get to know I have to add flag -all_load to fix the exception. When I add -all_load it prompts following error. Please Help me on this issue

ld: duplicate symbol OBJC_METACLASS$_CDataScanner in /Users/shafraz/src/proj/dedmau5AR/Hammerhead/src/build/Release-iphoneos/libHeammerhead.a(CDataScanner-AC393572D868394E.o) and /Users/shafraz/src/proj/dedmau5AR/Hammerhead/src/build/Release-iphoneos/libHeammerhead.a(CDataScanner-AC393572D868394E.o)

Exception:

2011-09-12 16:42:27.038 StringUnityTutorial[2395:307] -[TTURLRequestQueue performSelector:withObject:withObject:withObject:]: unrecognized selector sent to instance 0xf31990
2011-09-12 16:42:27.049 StringUnityTutorial[2395:307] *** Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: ‘-[TTURLRequestQueue performSelector:withObject:withObject:withObject:]: unrecognized selector sent to instance 0xf31990’

Maybe you added this lib twice to the project?