http://mydbr.com/doc/content/cmd.html#dbr.summary.options
This page is missing a single quote in the Basic summary columns example:
:
select 'dbr.sum', 'Items', 'Weight'; /* Calculate sum from Items and Weight column */
select 'dbr.max', 'Weight'; /* Calculate sum from Items and Weight column */
select 'dbr.count', 'Title;
^ 'Title;
Cheers