So I logged on Minecraft today hoping to play a server with my friend, and to remind this server was working last night. So I go to join but it says out of date although, I was on the same version as last night. I haven't changed anything, the server didn't go out. I'm just confused. Not only does it say "Out of date" it also shows this weird symbol. I've tried uninstalling and re-installing doesn't work. I've reset my PC doesn't work. Can somebody tell me how to fix this issue if there is one?