unknown TfrxDBDataset message when try to show report preview with pascal script

Hello,

I have problem.

I use this code from FastReportDemo exe file from report script in my own report:

procedure TableObject1OnManualBuild(Sender: TfrxComponent);

var

 DS: TfrxDBDataset;

begin

 DS := TfrxDBDataset(Report.GetDataset('Bio'));

...

end


but when try run this report preview (Ctrl+P) I catch "unknown TfrxDBDataset".

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