The error message is "Outdated server." How do I get in?? Thanks!

I checked, I am using the Latest Release.. so I don't know why I can't get on.

You need to use 1.11 to log in. 1.12 just came out today so none of the server plugins have been updated so we can't update the server yet. We are working on making the server compatible with 1.12 but we are not done with that yet.

1.11 isn't an option. 1.12 and 1.19 are the only options I have.

On the launcher you will have to go to Launch Options and then Add New. You should be able to see every version from there. Once you have done that you can go back to the News screen and select 1.11.