Newbie issue with Insecure React tutorial

I am trying the docker Insecure React tutorial
https://docs.openvidu.io/en/2.17.0/tutorials/openvidu-insecure-react/

I am getting the following error. Any ideas?

Please share with us the browser console.

How are you running OpenVidu?

I experienced the same problem while reading the tutorials.
Here is the console’s output

UPDATE: I downloaded the tutorial again and rerun it. Now runs fine. Very strange anyway. Im 100% sure i didnt change anything in the code