Error 522 when attempting to open webCore dashboard


I just installed a new ST hub, added some devices and webCore while meticulously following the installation instructions and video (gitHub install). I also got everything connected to Alexa, and voice commands work. But when I try to open I get a 522 error (see attached screenshot).

I’ve also attached a screenshot of the SmartApps tab in the SmartThings IDE.

I’ve been receiving the 522 error since yesterday, so it appears the problem is my config, and not webCore DashBoard or my internet connectivity.

Can anyone give me a clue of how to troubleshoot this?