Adding a Calculated field to divide one column by another

Banging my head against the wall. In a cell this is easy, in Pivot Table all I get is DIV/0 when I try to create a new custom field in the report to show a percentage calculation.

= COMPLETED / TOTAL ASSIGNED

I admit, my Pivot Skill is low low low. What am I missing?

In the DATA I added columns K & M trying to help, they aren't really part of the data, it's normally just A:J, fyi.

I'm at work using Office365.