Subversion Repositories taios

Error running this command: svn --non-interactive --config-dir /tmp log --xml --verbose -r HEAD:1 'file:////home/svn/taios/forums/add-category.php@256' --limit 2
svn: E195012: Unable to find repository location for 'file:///home/svn/taios/forums/add-category.php' in revision 524