Can't start session trace PLS-00302:component<>must be declared error (4232221)

I'm trying to start a session trace using my DBA account in and Oracle 8.0.6.1.0 database. This used to work fine under TOAD 9.0.1 last week. Now that I upgraded to TOAD 9.1.0 I receive these messages when starting a trace in the same database that worked before.

I go to Session Browser, I select a session I would like to trace. then click the green toolbar button that says "Start trace for these sessions". I take all the defaults on the "Start Trace" window that pops up. I click "OK". Then I get the following:

ORA-06550: line 1, column 23:
PLS-00302: component 'SET_BOOL_PARAM_IN_SESSION' must be declared
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
ORA-06550: line 1, column 100:
PLS-00302: component 'SET_INT_PARAM_IN_SESSION' must be declared
ORA-06550: line 1, column 84:
PL/SQL: Statement ignored
ORA-06550: line 1, column 176:
PLS-00302: component 'SET_INT_PARAM_IN_SESSION' must be declared
ORA-06550: line 1, column 160:
PL/SQL: Statement ignored