You're creating an object. An object is basically a special reference (in this case, and most other cases, a hash reference). A hash (whether it's a hash or a hash reference) can only contain scalar values or references as it's elements (same goes for arrays).

With this line:

$self->{KOLS} = %results;
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You're attemping to assign a hash to an element. You really need to do this:

$self->{KOLS} = \%results;
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You seem to have got the basic jist of objects in Perl, but I strongly recommend you read perlref before continuing.