Cant play custom maps with iwd files?

[PurplezHD]

Whenever i load Codjumper mod and try to start a map with an iwd file in it my call of duty 4 crashes and i get a message saying "impure client detected. Invalid .IWD files referenced! .usermaps/mp_(mapname)/mp_(mapname).iwd
It only happens when i load the map in codjumper mod and it happening for me and my friend any help would be appreciated

[Pedsdude]

Make sure you're using 'codjumperv3_1', and don't have any older versions of the CJ mod. Also, try removing any Mods and maps that you don't need.

[PurplezHD]

Yes , im using the version , iv deleted all other mod besides my promod and codjumper And everyone of my maps , no luck