Event trigger don't work in servers

So, I'm trying make a mod in MCreator to execute a list of commands when a player joins, player die, etc
But the problem is that when I export the mod and I test it in a Minecraft server, the events "Player joins the world", "On player tick update" or something don't work

Something I want to mention is that I'm not puting the mod in the server because I can not (Aternos)
I'm doing this in version 1.12.2 of minecraft
And I'm using MCreator 2020.2