class EVariantTypeCastError with message 'Could not convert variant of type (String) into type (Double)

Question

Using Delphi and FastReport I get this error message while debugging inside Delphi immediately after this line:

.ShowReport(true)         


        

Answer 1

I had a similar issue in FastReport. In my case, it was a wrong Format applied to a MemoView. I could find the name of the offending component this way:

• Use Break to stop the execution
• In the Call Stack panel, find the latest call from a fastreport class (in my case: frxClass.TfrxCustomMemoView.FormatData(...) and double click it.
• if you don't have the source code od Fast Report, a dialog appears - just hit Cancel
• in Local Variables panel, you will probably see name of the offending component / value / format.