I have a script that is working fine but I need to add one more touch. Given a certain cell content, I need to make the background color of that cell yellow. I have spent hours trying to use various things none of which work. This is what I am trying now.

my $format=$sheet->get_cell($i,$j)->get_format();
$format->set_color('yellow');
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All I get is a null pointer error on the 2nd line. Can someone help? TIA.