I am assuming your map has been run on a server before. From what I know, there are 3 main infection gametypes, the original 0.6 infection, later 0.6 infectionclass and the 0.7 infectioncroya
19:39
a 0.6 infection map might not work on 0.7 infectioncroya for example due to version disparities. (or might, who knows?)
that's why it would be useful what gametype your map uses and what gametype you trying to run it on. (this one is fair to assume, as 0.7 only has infcroya I believe)