ExcelBanter - What is wrong with this line?

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- - What is wrong with this line? (https://www.excelbanter.com/charts-charting-excel/101811-what-wrong-line.html)

ChartsToBe

What is wrong with this line?

mySeries[1] = mySeriesCollection.Add(myWorksheet.get_Range("D2", "D13"),
Excel.XlRowCol.xlColumns, false, false, false);

Causes this error... System.InvalidCastException was unhandled
OleAut reported a type mismatch.

What am I doing wrong?

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