Javascript Error on end to end client

[dtssagio]

Hi to all,
On google chrome browser version 79.0.3945.88 on Mac os x 10.15.2 the end-to-end static widget here: cloud-search-samples/end-to-end/search-interface/ gives the following error on startup:

The client don't work.
Tried with firefox 71 and even if I got the same error, the client is working.