Solving ORA-03001

I need some information on ORA-03001. I am running Brio and going against Oracle9i, and all of a sudden my query gives me this error and I don't know what they mean.
The following is the Error Messages guide description of error number 03001.

ORA-03001 unimplemented feature:
Cause: At attempt was made to use a feature that is not currently implemented.
Action: Do not attempt to use this feature at this time.

Check the compatible parameter and the optimizer_features_enabled parameter for your instance and make sure they are both up to the 9i version you are running. If either is set to an 8i level, that's what is causing your problem.