Kyrwyrgwll

As you can see from the title and image,this error keeps popping up whenever I join a server.This doesn't only happen to hexxit but other modpacks as well.Though this error doesn't show when I'm using the official launcher when joining servers there.I already confirmed it has nothing to do with my firewall as I disabled it while doing as above said but with the same result.I also suspected it was my anti-virus so i uninstalled it and tried to connect to a server with one of the modpacks using the technic launcher but there was no difference.I also checked my hosts file and reset it but still didn't work.I went to go into my router settings but there wasn't anything blocking technic or the servers.I did anything to solve it but it still wasn't fixed.