It is a cheap challenge I don’t expect you to fail. The simple fact? An article is missing in the clause. This is the indefinite article ‘a’, which should come before ‘meeting’ as indicated below.
We have meeting now. (Wrong)
We have a meeting now. (Correct)
As simple as the grammatical principle is supposed to be, it is often violated in practice, especially when people are speaking. So, it is not uncommon to hear:
Give me pencil.
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