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It means the server hasnt updated to a newer version of the game.
because you need to buy a premium account of minecraft.net
Maybe the server is temporarily not available or you are using anjocaido's minecraft launcher. If you have that you need to download Hamachi and Type Server iD IP Password and Gate
If it says login failed its either because your username or password is wrong or youdon'thave internet at the moment
To fix it, restart minecraft, and in the launcher, click the options button next to the login button and click force update, than try again