Horizon - Failed to connect to server > Crashes After

I’ve been trying to use Horizon, However, it stopped working a day after I purchased Diamond, It says “Failed to connect server!” after I clicked Ok, It says that it crashed.

Tried multiple ways and was wondering if someone can help me out. I already tried disabling anti virus, already tried Firewall.

Nevermind, Issue fixed, I had to delete the local app data folder from daring development and uninstall and reinstall horizon. Works fine now.