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HTML::Template->output() : fatal error in loop output : HTML::Template
+ : Attempt to set nonexistent parameter 'schedule_columns' - this par
+ameter name
 doesn't match any declarations in the template file : (die_on_bad_par
+ams => 1) at D:/Programme/Perl814/lib/HTML/Template.pm line 3304
 at martin3.pl line 121

    <TMPL_LOOP NAME=DATA_STRUCTURE>
            <TMPL_IF NAME=BGCOLOR_CUSTOMER>
...
                </TMPL_IF>
            </tr>
        </TMPL_LOOP>

for my $domain (keys %{$bi->{$customer}}) 
    {
...
    }
}
$template->param(DATA_STRUCTURE => \@data_structure_loop);