RA layer request failed - SVN

用SVN同步代码时抛出一个异常：

RA layer request failed
svn: Unable to connect to a repository at URL 'https://XXXX.java'
svn: Server sent unexpected return value (500 Internal Server Error) in response to OPTIONS request for 'https://XXXX.java'

Solution:

eclipse ---> preferences---> Team ---> SVN find SVN interface, change client to SVNKit

svn: E200007: CHECKOUT can only be performed on a version resource [at this time].

right click on the project -> team -> cleanup / refresh