svn: E155021 this client is too old to work with the working copy at

svn: E155021 this client is too old to work with the working copy at

环境：Subversion 1.8 and IntelliJ IDEA 13

按照如图提示更改就好了：

不积跬步，无以至千里，不积小流，无以成江河

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原文地址：https://www.cnblogs.com/sunteng-change-control/p/4432565.html