Hi there!
I believe it is because you are using the plugins for MZ on RPG Maker MV.
I have plugins for both MV and MZ:
- Eli_PluginName = For RPG Maker MV
- EliMZ_PluginName = For RPG Maker MZ
I can see on your error screenshot, that you are using the EliMZ_MessageActions. And you should use the Eli_MessageActions instead.