Can you provide information about the code that you're executing at the time you get this error? Are you explicitly setting the isolation level, or is the code doing it automatically?
I notice that the PostgreSQL 8.1.5 documentation says:
"The transaction isolation level cannot be changed after the first query or data-modification statement (SELECT, INSERT, DELETE, UPDATE, FETCH, or COPY) of a transaction has been executed."
Does this apply to your situation?
-Jim
Message was edited by:
Jim.Davidson