Flex Charting

i have purchased flex charting , added serial number license management section in flex builder 2 , of charts have created not displaying @ all. getting error telling me

"severity description resource in folder location creation time id
1 design mode: error creating item columnchart in parent canvas "mortgage calculator". please choose design > refresh refresh design mode. productdetails.mxml flexstore/productsview january 11, 2007 10:59:59 2328"

however "refresh" option nothing solve problem. idea wrong?

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