ld: file not found: /Users/weihua0618/Library/Developer/Xcode/DerivedData/TeamTalk-gtjcaddpxjrjujedduefrhfxysmw/Build/Products/Debug-iphonesimulator/IOSDuoduo.app/IOSDuoduo
clang: error: linker command failed with exit code 1 (use -v to see invocation)