Attempted to create unknown entity type event_falling!

I got like 159 lines spammed with that, also the server takes like a minute to mapchange, before it was like 10 seconds, sometimes the server even crashes, whats the problem?

The addons:

plus the collection: http://steamcommunity.com/sharedfiles/filedetails/?id=450404611

I dont know why it happens.

Take a look for errors than for that line