How to mergecell with XLSReadWritwII 6?(Not nedd answer!)

[allen]

In old version,
XLS.Sheets[0].MergedCells.Add(Col1,Row1,Col2,Row2);

But in XLSReadWritwII 6
It's a error!

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Sorry! I write a error! It works well!
XLS.Sheets[0].MergedCells.Add(Col1,Row1,Col2,Row2);