Subversion Repositories shark

Error running this command: /usr/local/bin/svn --non-interactive --config-dir /tmp log --xml --verbose -r 1687:1 'file:///home/shark/svn/shark/trunk/ports/png/pngconf.h@1687' --limit 2
svn: E160013: File not found: revision 1687, path '/shark/trunk/ports/png/pngconf.h'