EvanLjp commented on issue #4316: cannot compile with offical doc URL: https://github.com/apache/skywalking/issues/4316#issuecomment-581908298 ![image](https://user-images.githubusercontent.com/31562192/73748635-cee3f800-4794-11ea-8223-bce8f96e6ad0.png) ![image](https://user-images.githubusercontent.com/31562192/73748656-d99e8d00-4794-11ea-9223-1ae8d7d5175e.png) still have this problem ,when git checkout v6.6.0
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