is it right after you turn the corner after exiting the small room from the vent and then you hear a flare and it crashes? because that's what it is for me

Yep. That's the thing wheare the game crash.

can the mod author or anyone who knows how to fix this problem please respond, this map look really cool and id like to play it.

same problem here, when the flare comes

you could play the map with addons all other addons disabled, it works for me

Thanks to the people that are responsible! It is seen that you are trying to help

Had the same thing occure. After the crash, I restarted Gmod and then the map started working just fine. Guess, it's a bit of Russian Roulette with the start of this map on whether it'll crash or not.

Added: I've found a consistent way of not crashing towards the beginning. At least, with the crash that'll happen if you view a flare getting shot up into the air after you go through a vent grate and round a corner (after the sniper). Just quickly go back around the corner, look away from where the flare is, and admire the view or something for a few seconds. If you heard the firing sound when you did this then you know you hit the trigger and should be safe in a few seconds.