iPhone SDK - duplicate symbol error? How do I fix this?

Question

Error log

Build test of project test with configuration Debug

Ld build/Debug-iphonesimulator/test.app/test normal i386 cd "/Users/justine/Desktop/test - iPhone/test" setenv MACOSX_DEPLOYMENT_TARGET 10.6 setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk "-L/Users/justine/Desktop/test - iPhone/test/build/Debug-iphonesimulator" "-F/Users/justine/Desktop/test - iPhone/test/build/Debug-iphonesimulator" -filelist "/Users/justine/Desktop/test - iPhone/test/build/test.build/Debug-iphonesimulator/test.build/Objects-normal/i386/test.LinkFileList" -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -framework Foundation -framework UIKit -framework CoreGraphics -framework CFNetwork -framework MobileCoreServices -framework SystemConfiguration -lz.1.2.3 -o "/Users/justine/Desktop/test - iPhone/test/build/Debug-iphonesimulator/test.app/test"

ld: duplicate symbol _OBJC_IVAR_$_ASIAuthenticationDialog.request in /Users/justine/Desktop/test - iPhone/test/build/test.build/Debug-iphonesimulator/test.build/Objects-normal/i386/ASIAuthenticationDialog-F3DE19D52DB79A72.o and /Users/justine/Desktop/test - iPhone/test/build/test.build/Debug-iphonesimulator/test.build/Objects-normal/i386/ASIAuthenticationDialog-6A37D8A080A72C67.o collect2: ld returned 1 exit status Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1

Answer 1

It seems you have a duplicated file:

ld: duplicate symbol ..........

For what i see its called ASIAuthenticationDialog. Check for that one.