Perhaps it lost something in the paste or, as Dave indicates, you need to
the appropriate workbook is active.
I note that you are using a mix of named sheet and sheet index in your code.
Is this what you intend (i.e The sheet named A will appear second in your
tab order after the code runs). Alternatively did you want it to appear
after another specific sheet? The following might help
You can swap two sheets continuously in the same workbook using the same
code if you use the sheet index rather than the sheet name:
Sub Macro1()
Sheets(1).Move After:=Sheets(2)
End Sub
Run the above several times and note the change in location of your first
two sheets in tab order each time.
Now try
Sub Macro1()
Sheets("Sheet1").Move After:=Sheets("Sheet2")
End Sub
After ensuring you have sheets names Sheet1 and Sheet2 in your workbook.