Failed To Connect To Server Error

So, I have used horizon for a while now and could run it with no problem right. Today I was going to make a modded advanced warfare gamemode and I get Failed To Connect To Server then Horizon crashes I use AVG I always have it disabled when modding and I run Horizon as a administrator and it still crashes I have restarted my PC many times and still nothing happens any suggestions for me?

So horizon crashed before it could boot into offline mode

Yes

First make an exeption for horizon in AVG then disable AVG completely. After that, disable your internet connection and start horizon.