Subversion Repositories WebE

Error running this command: svn --non-interactive --config-dir /tmp log --xml --verbose -r 18:18 'file:////home/mw3020/f001/svn/FFHS/WebE/trunk/WebContent/admin/nav.jsp@18' --limit 1
svn: E160013: File not found: revision 18, path '/trunk/WebContent/admin/nav.jsp'