Subversion Repositories sssnakesss

Error running this command: svn --non-interactive --config-dir /tmp log --xml --verbose -r HEAD:1 'file:////home/svn/sssnakesss/src/snake.cpp@4' --limit 2
svn: E195012: Unable to find repository location for 'file:///home/svn/sssnakesss/src/snake.cpp' in revision 17