config.json error

[sungchol3]

I download all files and open test-all.html. But, he prints "fail to read config.json. error". What do I wrong?

[porduna]

It will run an http request in the beginning, so if you are opening it in your file system (file:///...) it may fail loading the config.json. Please try opening hosting it in a web server. For example, if you have Python 3, you can run

python -m http.server 8000

And going to http://localhost:8000/test-all.html should work.