Dipanjana 0 Light Poster

I have added month name in category field, percentage on y axis , data in series field and data has values : half day complete, full day complete,half day incomplete and full day incomplete, I have added count(Data) in data field .
I am able to get the data values in the legend series as the series name but one extra series (Series1) appears in the legend. How can I remove the extra series ?
Someone pls help .