Fusion-Voice integration error: Plugin Mismatch requested/IncompatibleConfiguration

I'm trying to make an integration between Fusion and Voice, following the steps in this repo: https://github.com/Hamza-EG/FusionVoiceIntegration?utm_source=sendgrid.com&utm_medium=email&utm_campaign=sendgrid

But when I try to run the 0-Minimal Demo, I get these 2 errors when I try to start an instance ("Host" or "Shared Client") in Unity Editor by entering playmode:

Currently, it only works properly, when I run the "Single player". So I'm not sure about what is wrong here if I followed each step carefully.

Does anyone else have this issue, or know how to fix it? Thanks in advance for your replies.