when I try to use the map i get this error
[COLOR=Red]iwd sum/name mismatch[/COLOR]
anyone know how to fix this problem?
Its an error where either the client, or the server has too many iwd files. You can only have a maximum of 4 extra iwd files used at any one time. Go to 5, and you hit this error.
The error actually means exactly that: the total number of iwd files (the sum) is greater than the expected number allowed in the game. Hence, [color=red]iwd sum mismatch[/color]
This is a bug in the game, and many modders are working with IW to resolve it.
As a temp resolution, remove as many mods from your 'main' folder as possible, particularly when attempting to play on servers with custom maps. However, this is mainly a server problem, where the admins have added too many extra iwd files.