When i try joining a server this happens

i dont know if anyone knows what the problem is but if u do please tell me because ive been trying to resolve this for over a month now and im sick and tired of trying and failing so someone please help

https://gyazo.com/2bf623dbe2e73388f9d4b5b1e664c716

this is what happens when i try and join a server

ps: i dont know what this is called so that is why i did not search it up