Subversion Repositories sw_hrp

Error running this command: svn --non-interactive --config-dir /tmp/websvn log --xml --quiet --limit 40 -r -1:1 'file:///var/svn-repos/sw_hrp/lowres/sprites/props/0501.png@-1'
No output on STDOUT.E205000: Syntax error in revision argument '-1:1'