French language Q&A Forum

I am having trouble reconciling the 'correct' answer to the test question with the lesson. Specifically, below is the question and correct answer according to the program, but this use of 'attend un garçon' meaning 'expecting' does not seem to reflect the lesson. What do I have wrong?

Above it says that with a noun it should be:  

avoir besoin de/d' + (article) + noun

but then below it says:  

Verbal phrases like avoir besoin de don't use the definitive article (or partitive article).

These seem contradictory.  If I want to say: 

"You need flour" 

Do I say:  "Tu as besoin de farine"   or   "Tu as besoin de la farine"

Could someone please clarify with respect to both countable and uncountable items.