oday i tried to compile in Xcode 5.1 my sample app and i got linker error can someone tell me why is it happening ? Ld /Users/mmmssss/Library/Developer/Xcode/DerivedData/Slot321-ggaqzqgvjcazkuaqnngfqbbcfvvw/Build/Intermediates/Slot321.build/Debug-iphoneos/Slot321\ iOS.build/Objects-normal/arm64/Slot321\ iOS normal arm64 cd /Users/mmmssss/Documents/xcode5_projects/Slot321/Slot321/proj.ios_mac expor