Where can I find a list of the units required for the various graphs?

I'm using Delphi 7, ReportBuilder 10 and TeeChart Pro 7.06. When I setup a report to use bar charts, I get a message when the form loads:

"Class THistogramSeries not found. "

How do I get around this?

My data consists of records with a date, a scheduled count and a total count. I'm using dates to label the bottom axis and then two series to show the schedued and total available for each date. The problem is that, there is only one record per date in my data, the date is repeated several times as ...