Which client are you using?
Which OS are you using?
Well the obvious fix would be to check if you are using the correct tibia version to connect to the server, have you done that?
Does this message still occurs when you are using the own client of hexera.net?
I used the custom client of hexera and there weren't any issues for me.
[Windows 10 Pro 64bit, Hexera tibia client 10.1]