Hi hesco,

The problem is that you're trying to assign to a hash reference, but you're using parentheses "( ... )" instead of braces "{ ... }".

Try this instead:

$test_subscriptions->{"test_case-$j"} = {
      'fname' => $lname,
      'lname' => $fname,
        'zip' => '02486',
      'email' => $email,
      'lists' => ['news','updates','vols-annc'],
}
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Update:  Oh, and I'm betting that in your program, line 124 is the one containing

$test_subscriptions->{"test_case-$j"} = {
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because that's where I had to position the hash assignment to get exactly the same wording as in the error message you got.  But I don't know what's going on with your line 66:

Can't call method "isa" without a package or object reference at line 
+66.
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For that one, you'll have to give us more clues ;-)