Cluster Columns Chart: I am not able to add data - error "The data range is too complex..." Not sure how to fix?

[ez08mba]

I've spent an hour and searching the net and cannot find an adquate explanation or solution. I'm trying to add the September data to a Cluster Column chart and it will not appear either in title or in bars on the chart. I've tried adusting using the formating and Select Data Source windows but can't seem to figure it out. I'm sure it is just a simple thing I'm overlooking. Would anyone have a suggestion or solution?

I've attached postings in the past but don't seem to have the ability now.

Thanks