Is it acceptable to say "No users have configured this setting"? It is an error message. It sounds odd to me. "None of the users have configured this setting" seems OK. Please provide your advice.
The first would be the more usual.
We might favour the second, if we cared about a particular subset of users. E.g. if users were split into groups, and we were only talking about a particular group, then it might be strictly-speaking incorrect to say "no users have configured this setting" because some in another group might have, while "none of the users have configured this setting" would mean no user in the set we care about right now have.
That said, if your error message is relating to the fact that a setting has not been configured as a global aspect of the system, then you care about it not being set rather than the fact that this would involve a user. If this is your case then "This setting has not been configured" might be better.