Ok, so I fixed the spellnig eror but still get the KeyError exception.
I did try the query in mysql CLI and got back 2808 rows.
select nouns.noun,
hull_class.hull_class,
count(hull_class.hull_class) AS prob_count
from problems, nouns, hull_class
where problems.noun_rel = nouns.noun_id and
problems.hullc_rel = hull_class.hullc_id
group by nouns.noun, hull_class.hull_class
-scooter