Call of Duty: World at War

1)i put it in my mods folder

2) i lopen cod waw

3) i go to mods

4) i click the map which is called afterwar then i click launch

5)cod waw closes then reopens

6) i click the button next to the #1

7) it type /devmap nazi_zombie_afterwar then i click enter

8) activision loading screen comes loadings done and i the screens all black i could hear myself shooting and stuff but cant see anything

this is the only map tht does this.

thank you