Hi monks, i'm new PERL learner and i'm stuck.I dont understand what does this " "some variable" requires explicit package name" warning mean?

#!\usr\bin\perl
use strict;
use warnings;

my %ders_kodu = (
    324 => "reaktor",
    342 => "isi",
    );
print $ders_kodu{"324"};

[download]

Can someone help me with this ?

In reply to Explicit package name Warning!!! by m_alper_yildiz

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