AnkhSVN Exception error (branching solution)

I always get the error message below whenever I try to branch solution using AnkhSVN which is integrated in Visual Studio 2005:

SharpSvn.SvnReposito​ryIOException:
Repository moved permanently to 'http://'; please relocate
at SharpSvn.SvnClientAr​gs.HandleResult(SvnC​lientContext client, SvnException error)
at SharpSvn.SvnClientAr​gs.HandleResult(SvnC​lientContext client, svn_error_t* error)
at SharpSvn.SvnClient.R​emoteCopy[TSvnTarget​](ICollection`1 sourceTargets, Uri toUri, SvnCopyArgs args, SvnCommitResult& result)
at SharpSvn.SvnClient.R​emoteCopy(SvnTarget sourceTarget, Uri toUri, SvnCopyArgs args)
at Ankh.Commands.Branch​SolutionCommand.<​>c__DisplayClass4​.b_​_0(Object sender, ProgressWorkerArgs ee)
at Ankh.ProgressRunnerS​ervice.ProgressRunne​r.Run(Object arg)

ankh-version=2.1.7362.250
command=SolutionBranch
svn-version=1.6.5
sharpsvn-version=1.6​005.1351.39149
vs-version=8.0.50727.42
os-version=5.1.2600.196608

How can I be able to use branching in AnkhSVN? How would I know the network protocol used in our Subversion server? It seems that http was used as the protocol. I also don't know the subversion repository URL used to create our subversion server since our admin is unavailable.

Thanks for the help!