error in starting

[brewmaster012]

Hi, very interesting project! I checked out a few years ago and it worked very well. Today I tried again but it failed to display anything with the following error in console

Uncaught (in promise) TypeError: Illegal invocation
    at jsxFactory (UiComponent.js:18:17)
    at Browser.render (Browser.js:42:17)
    at Browser.run (Runnable.js:10:30)
    at eval (bootstrap.js:396:9)
    at loaded_cb (VM8 bootstrap.js:17:40)

I tried both the online version serve the static site locally. I tried to debug it briefly but it seems to be beyond my capability to do so.