"Command have not been found" error

Hello all,

I'm attempting to follow this tutorial
<http://wiki.svnkit.com/Diffing%20a%20working%20copy%20against%20a%20repository>
but in Clojure and I'm getting this error:

SVNException svn: E200007: Runner for 'org.tmatesoft.svn.core.wc2.SvnDiff'
command have not been found; probably not yet implement in this API.
org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error
(SVNErrorManager.java:64)

It's correct that I don't have org.tmatesoft.svn.core.wc2.SvnDiff - but it
doesn't seem to me like that class is supposed to exist, so I don't know
what's going wrong. This is my code:

(defn attemptDiff []
  (let [diffClient (.. SVNClientManager newInstance getDiffClient)
        file (new java.io.File
"http://svn.svnkit.com/repos/svnkit/trunk/README.txt")
       ]
    (with-open [outStream (output-stream "/home/user/diff.txt")]
      (. diffClient doDiff file (. SVNRevision UNDEFINED) (. SVNRevision
WORKING)
         (. SVNRevision HEAD) (. SVNDepth INFINITY) true outStream nil)
      )
    )
  )

I've tried using both a local version of the file as well as the remote one
since one web page seemed to indicate this could be the problem. Does anyone
know what the problem could be?

Thanks in advance,
-Ben

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