At least one of the elements of @$refdataarr isn't an array ref (it's a 13), so @$a is failing. It couldn't be clearer, and you really only needed the one line of code -- since we can't see what's populating $refdataarr anyway. 
eval { use strict; () = sort { @$a <=> @$b } ([1], [2], 13) };
warn "Your error I believe: $@";

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-Paul

In reply to Re: "strict" violation on "sort" command with perl 5.10 by jettero
in thread "strict" violation on "sort" command with perl 5.10 by mstet

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