Error when i try to start my custom story ! HELP

[Your Computer]

I doubt the .lang file would crash the system. The game tends to just ignore the .lang file if there is something wrong with it.

If that's all that the hpl.log shows, then this is going to be a bit tougher to debug. Is the "new level" you "put up" the first level of the story? Are there any files where your map files are that you didn't create? Are you making use of custom entities or objects?