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macosx 10.10 cocoalumberjack链接器错误

macosx 10.10 cocoalumberjack链接器错误,cocoalumberjack,Cocoalumberjack,我使用pod将cocoalumberjack安装到我的macosx项目中。这是错误消息的输出 Undefined symbols for architecture x86_64: "_OBJC_CLASS_$_DDLog", referenced from: objc-class-ref in AppDelegate.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command fai

我使用pod将cocoalumberjack安装到我的macosx项目中。这是错误消息的输出

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_DDLog", referenced from:
      objc-class-ref in AppDelegate.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
你能让它工作吗？出了什么问题？