I'm not too sure about what version it changed in, but in newer versions the number of params to selectall_hashref has changed:
$ary_ref = $dbh->selectall_hashref($statement);
$hash_ref = $dbh->selectall_hashref($statement, $key_field);
To quote the man page:
This utility method combines the prepare, execute, and fetchall_hashref entries elsewhere in this document into a single call. It returns a reference to a hash containing one entry for each row. The key for each row entry is specified by $key_field. The value is a reference to a hash returned by "fetchrow_hashref".
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