Application Express :: Error Upgrading From 4.0.1.00.03 To 4.1.1?

I receive this error. In my opinion the problem could be related to the presence of one personalized authentication schemas, based on a DB function, taken from a Packaged application, some years ago, called "menu_framework".
This is the error report:
........
-- Now beginning upgrade. This will take several minutes.-------
-- Ensuring template names are unique -------
-- Migrating metadata to new schema -------
-- Switching builder to new schema -------
begin
*
ERRORE alla riga 1:
ORA-00600: codice di errore interno, argomenti: [kgiinb_invalid_obj],
[0x26962168], [0x1A1042F4], [], [], [], [], [], [], [], [], []

1) after the error trap, I copied the Image folder and tried to launch APEX. It was possible to lunch the development pages, but impossible to execute any application with the error: Authentication Schema not Supported
2) then decided to downgrade to APEX 4.0, following the proper instructions: received a similar error:
.......
SQL> exec apex_040000.wwv_flow_upgrade.switch_schemas('APEX_040100','APEX_040000
');
BEGIN apex_040000.wwv_flow_upgrade.switch_schemas('APEX_040100','APEX_040000');
END;

ERRORE alla riga 1:
ORA-00600: codice di errore interno, argomenti: [kgiinb_invalid_obj],
[0x16D5D9E4], [0x27F2074C], [], [], [], [], [], [], [], [], []

The execution of application reported the same problem.Then decided to restore the entirre DB.

Where is my problem?Are my suspects real or the Authentication schema malfunctiong is a conseguence of the upgrade error?