svn: The working copy at workspace is too old (format 29) to work with client version '1.9.3 (r17185

is too old (format 29) to work with client version ‘1.9.3 (r1718519)’

描述：eclipse 升级SVN插件后，同步项目总是提示Error信息。
svn: The working copy at workspace
is too old (format 29) to work with client version ‘1.9.3 (r1718519)’ (expects format 31). You need to upgrade the working copy first.

解决方法：右击项目——>‘Team’——>‘Upgrade’