I'm trying to color the background of a row if a certain
set of conditions exists.

I don't know what's wrong with this:

For i = rng.Row To 1 Step -1

If Cells(i, 9).Value = Cells(i - 1, 10).Value _
And Cells(i, 10).Value = Cells(i - 1, 9).Value _
And Cells(i, 1).Value = Cells(i - 1, 1).Value _
And Cells(i, 2).Value = Cells(i - 1, 2).Value _
Then Cells(i, 1).EntireRow.Interior.ColorIndex = 35
end if
Next

I've tried taking out the "end if", including just "end",
but nothing works??? I get a 1004 error.