Subversion Repositories ALCASAR

Error running this command: svn --non-interactive --config-dir /tmp/websvn log --xml --quiet --limit 40 -r -1:1 'file:///var/www/svn/repos/alcasar/trunk/rpms/x86_64/ipt-netflow-2.5-1.mga7.x86_64.rpm@-1'
No output on STDOUT.E205000: Syntax error in revision argument '-1:1'