Error occurs with -sort option

[CHUL PARK]

Error occurs with -sort option:
Undefined subroutine &main::dump_sorting called at /usr/lib/x86_64-linux-gnu/perl/5.34/Data/Dumper.pm line 449.

I think dump_sorting should be dumpSorting:
if($In::Opt{"SortDump"})
{
    $Data::Dumper::Useperl = 1;
    $Data::Dumper::Sortkeys = &dump_sorting;
}