The module fails to create an object. As a result $overlay is undefined.
You should check the result of object creation and have a look at @Config::IniFiles::errors upon failure.
my $cfg = Config::IniFiles->new( -file => 'test.ini' )
or die "Failed to create Config::IniFiles object: @Config::IniFiles:
+:errors\n";
addendum: example:
0 linuxer@host /tmp $ cat /tmp/a.pl && perl /tmp/a.pl
#! /usr/bin/perl
use strict;
use warnings;
use Config::IniFiles;
my $overlay = Config::IniFiles->new(-file => 'test.ini')
or die "Failure: @Config::IniFiles::errors\n";
$overlay->newval("section1", "arg1", "anotherval");
$overlay->WriteConfig(-delta=>1);
__END__
Failure: Empty file treated as error
255 linuxer@host /tmp $
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