PL/SQL :: PLS-00306 - Wrong Number Or Type Of Argument In Call To MULTISET_UNION_ALL

I'm trying to use MULTISET UNION to append several collections into a single recordset.The select queries shown for the CURSOR are simple beta versions of the real queries which have about 350 fields to each of them. I will be appending data from 15 of these queries which each will with no more than 20 records per query into a new single recordset (not sure if 'recordset' is the correct phrase or term for what I mean, it could be ARRAY, OBJECT, COLLECTION or something else all together).

Here is text of the ERROR message:

ORA-06550: line 63, column 1:
PLS-00306: wrong number or type of argument in call to 'MULTISET_UNION_ALL'

ORA-06550: line 62, column 1:
PL/SQL: Statement ignored

ORA-06550: line 71, column 36:
PLS-00487: Invalid reference to variable 'VARCHAR2'

ORA-06550: line 71, column 5:
PL/SQL: Statement ignored

I think the error has to do with some defect in my declare statements.

DECLARE
  MyTID varchar2(10);

  CURSOR Cursor_rst1 IS
      SELECT d_owner_internal_id,
             d_internal_id,
             d_tid,
             d_entity_name,
             d_form_seq
        FROM rtns.itas_rtn_ct_1120_cor tblRecords
       WHERE d_form_seq = '2710' --Tax Year =2003
         AND D_TID = MyTID;
[code]....