Duplicating StringGrid

[asdf]

Picture 1. & 1a = In small/test project, it worked well.
----------------------------------------------------

But in my real project, it had error message.

Picture 2 = My real project.

Picture 3 = The error message.

In previous tabsheet, FixedAssetRegisterBodyStringGrid.FixedRows:=3;
In this tabsheet, if I use DepreciationHeaderStringGrid.RowCount:= 4, it is ok.
But if I used DepreciationHeaderStringGrid.RowCount:= FixedAssetRegisterBodyStringGrid.FixedRows +1; , it shows error message(Picture 3).

[Blaazen]

I think it is clear. Error message tells you what to do.
Simply swap two lines:

StringGrid2.RowCount:=StringGrid1.RowCount;
StringGrid2.FixedRows:=StringGrid1.FixedRows;

because you must at first add rows and then decide how many of them  will be "header".

[asdf]

OMG!

Thank you so much Blaazen, it really worked .