This is happening to me too. I've entered the code:
when 'kale-smoothie' then 'smoothie'
when 'banana-smoothie' then 'smoothie'
when 'orange-juice' then 'drink'
when 'soda' then 'drink'
when 'blt' then 'sandwich'
when 'grilled-cheese' then 'sandwich'
when 'tikka-masala' then 'dinner'
when 'chicken-parm' then 'dinner'
end as category
order by id
and it keeps saying it is incorrect. The error message says 'add category' when i have! The query results look correct, too. Can anyone help?