Hi @Neary-li
I’m sorry but I think it will be quite difficult to get to the bottom of why that error is coming up.
As mentioned I also had quite a few difficulties getting it working: the repo was pretty old last time I checked and it’s also quite a complex setup overall so there could be a huge number of things that have gone wrong, either with your setup of it or with the code no longer working unchanged with current browsers and/or backend infrastructure.
If you’re keen to use it, I would suggest trying to get in touch with someone from RASA on the forum to see if they have plans to maintain the demo - if it’s being maintained then that should reduce the chances that it has become incompatible with current tools (on the RASA side and with modern browsers).
If you can’t do that but wish to proceed anyway then I think you’d need to start debugging the front-end code. From what I can see there may be a problem with it listening to the mic, so it might be that your browser is blocking permission or that the way that works has changed (eg where the error message mentions Recorder not defined with startUserMedia)
I know that hasn’t solved your issue but I hope it’s at least a help in where you might start. Best of luck!
Kind regards, Neil