Subversion Repositories ES

Error running this command: svn --non-interactive --config-dir /tmp list --xml -r 6 'file:////home/mw3020/f001/svn/FFHS/ES/trunk/bin/ch@'
warning: W160013: File not found: revision 20, path '/trunk/bin/ch'<br />
E200009: Could not list all targets because some targets don't exist