COULD NOT OPEN MISSION.LVL

[DarkHunter]

Hi again men, and sorry for asking again, but continually I have differents problems with mod tools visualmunge.
Now I ve decided to create a new map because my previus map have a lot of errors, but the new inconvenient is that when I create a new map, and play it, the game crash with the message: COULD NOT OPEN MISSION.LVL
help please. Thanks.