Subversion Repositories nw_plus

Error running this command: svn --non-interactive --config-dir /tmp/websvn list --xml -r 64 'file:///var/svn-repos/nw_plus/nw_hrp@78'
E195012: Unable to find repository location for 'file:///var/svn-repos/nw_plus/nw_hrp' in revision 64