No content showing up in app

Shopify Partner
19 0 11



I am following the tutorial "Build a Shopify App with Node and React" to build an app. The content of the app just randomly disappears and I get a bunch of errors in console after some time as shown in the picture below.



Sometimes no errors show up at all but the content doesn't load. I tried checking out the code from github repo and faced the same issue. Sometimes the content shows up and sometimes it doesn't. What could be the reason?