I'm having the same issue with MessageActions, with the same error in F12. I've tried refreshing the parameters, which then gives me a different error
My Parameters are set to the default
Hi!
You are not having the same error.
Your error is probably because you are not using my core plugin, the Eli Book. It need to be installed, and it need to be above all Eli plugins.
Also make sure you are using the plugin versions that matches your RPG Maker. The MZ ones, has MZ on the filename. The MV ones, does not have MZ on the filename.