Hi there! Thanks for the report :)
This problem typically happens because the Message manager is not installed. But you said you have the 3 required plugins, which I assume they are:
- Eli Book ( Most recent version: 5.4.12)
- Message Manager (Most recent version: 1.2.0)
- Message Scroll (Most recent version: 1.0.0)
They need to be on that order too. Meaning, not exactly one below the other, but somewhere on your plugin manager list, below the other. If you make sure of that, and the problem persists, trigger the error again, and press F12/F8 a browser window will be opened. Then move to the CONSOLE tab, and send me a screenshot of the error trace that will be there.
