I am pulling my hair out trying to figure out what is wrong with this line:

rng.Offset(4, 0).RowHeight.AutoFit
I've tried a number of different ways of writing this such as:

rng.Offset(4, 0).Rows.RowHeight.AutoFit
Rng refers to a single cell that is passed to my subroutine from a calling sub. It keeps saying:

Run Time Error '424': Object Required

Please help me figure this out.