Subversion Repositories shark

Error running this command: /usr/local/bin/svn --non-interactive --config-dir /tmp list --xml -r 12 'file:///home/shark/svn/shark/trunk/kernel/init@40'
warning: W160013: File not found: revision 40, path '/shark/trunk/kernel/init'<br />
E200009: Could not list all targets because some targets don't exist