Demo page's not working

[bhuvan-ganesan]

Uncaught Error: Assertion failed
at n (webcomponents.min.js:formatted:91)
at t._ (webcomponents.min.js:formatted:1547)
at t.r (webcomponents.min.js:formatted:2137)
at new l (webcomponents.min.js:formatted:2290)
at t.HTMLElement (native-shim.js:38)
at new t (orgchart-webcomponents.js?bafc***:2)
at t. (l2r.js:20)
at g (webcomponents.min.js:formatted:913)
at w (webcomponents.min.js:formatted:868)
at f (webcomponents.min.js:formatted:850)