"A man reads a newspapers"
Should be accepted as a typo in this case (it was obviously meant correctly because of the 'a'). Oddly my android keyboard always wants to replace "newspaper" with "newspapers".
This is not something us contributors can fix. As a general rule, Duolingo will reject typos that change the meaning of a word, even if it is just one letter. Many a/an typos are rejected for this reason, for example.
but why then at some examples, it says its incorrect? like in this one... they gave me red one because i wrote is reading! (and it happened before, like there is some silent rule when the verbs are magically both, and when only -s or -ing :(
that is what i'm wondering also, because it happened on more than one occasion they said my answer is wrong, like on this one, because i used continuous. like there is some silent rule they don't explain... so frustrating