[Zope] Problem with ZOracleDA

While using ZORACLEDA (the prebuilt NT4 binary) I'm getting the following error for an insert statement, when I copy the insert statement to PL/SQL it works fine ?? Any ideas Error: (24374, 'ORA-24374: define not done before fetch or execute and fetch') The ZSQL looks something like this: insert into dropdown_meta_table (mt_id, table_name, labelColumn, valueColumn) values(<dtml-sqlvar mt_id type=string>, <dtml-sqlvar table_name type=string>, <dtml-sqlvar labelColumn type=string>, <dtml-sqlvar valueColumn type=string>)