Hi Aternos Team
Could you please update the following plugin?
Name: ProtocolSupport
Link: https://www.spigotmc.org/resources/protocolsupport.7201/
Description: Help servers to work in more versions of minecraft
Posts by HDT
The Aternos forums are now deprecated
Learn more about this change here.
For help regarding Aternos, we recommend you to visit our support center.