Either the launcher or catcher crashes the game.
I put 1 of each in and it crashed the game.
Youme, is this your own original work? (Just curious.)
Although I'm against mappers using downloaded prefab-packs (mainly because it makes them lazy), it appears you put a great deal of effort into this. Good job. I also advice mappers to make their own entity setups, because it's so much more satisfying when you get it working.
One of their origins might have been in the wall and/or null and that killed it.
How do you select the prefab in Hammer? Is it under 'world model'? I have extracted it but don't know how to place it in the map.
Thanks I'll have a look at it, will save me some time figuring some stuff out.