OK, I think I can tell you what your problem is, it's an easy mistake to make as hashes can be so confusing sometimes.

Basically, after line 51 you have an single entry array [$n-name] in:

$judge{$j_name}->{Nominee}
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Which is fine, but this means, if you call:

$judge{$j_name}->{Nominee}
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you get [$n-name]. And you MAKE that call, in line 52, when you say:

$judge{$j_name}->{Nominee}->{Scores}
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So you're turning around and saying that [$n-name] is also %Scores. Hence the error.

Solution:

51  push @{$judge{$j_name}->{Nominee}->{$n_name}->{Scores}},
         $mentor,$ptcare,$clinres;
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OR

51 push @{$judge{$j_name}->{Nominee}->{$n_name}},
         $mentor,$ptcare,$clinres;
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Hope I got that right.

Cheers
Sam