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A parallel query process will record the full error stack into its trace file.
This trace file will be in the bdump_dest (the same location as the alert log)
log onto your database server cd to this directory and look for a trace file with a timestamp that is about the same time as your error.
look at these trace files (or grep for the error if you are on *nix).
You should find a full error stack
Post back if you need more help