How would you say “I want neither a sandwich nor a borrito”

One of my answers is “No me apetece un bocadillo ni un burrito”.

According to the corrector, this answer is wrong.

I do not understand because in the explanations, there is a note which reads as follows:

“We sometimes omit the first “ni” and only use the “ni” in the second element of the sentence with a verb in negative”