Subversion Repositories Scribus

Error running this command: /usr/local/bin/svn --non-interactive --config-dir /tmp list --xml -r 454 'file:///svn/Scribus/trunk/Scribus/scribus-api@20391'
warning: W160013: File not found: revision 20391, path '/trunk/Scribus/scribus-api'<br />
E200009: Could not list all targets because some targets don't exist