java.lang.nullpointerexception

- Make sure your server is shown as online on our website
- Make sure that your server has cracked enabled on https://aternos.org/options
- Make sure that you have installed the same version on your client as on your server
- If you use a modpack or mod, make sure they are installed in the same configuration as on your server
- Check the console and logs of your server after you've tried to join your server. Maybe there is error message
- Make sure that the ip you've entered into your client is correct.
- Try to use the DynIP, see https://guide.aternos.org/connect
- More information: https://guide.aternos.org/connect