one/some of your datapack(s) is causing the crash, remove the datapacks that don't support 1.16.5
okay, so i deleted datapacks. nothing, changed to forge nothing
forge log: https://mclo.gs/VtueH1F
mohist new log: https://mclo.gs/Pb7KEE9
Learn more about this change here.
For help regarding Aternos, we recommend you to visit our support center.