Is there any restriction for the markdown previewer to work well?

I have been trying to build this project for quite some time now but it stopped rendering when I used the markdown library methods. Can anyone please tell me why it stopped? Here’s the code

You don’t seem to be using the correct URL for the marked library in the JS Settings.

If you search “marked” in the " Add External Scripts/Pens" section under JS Settings, you should see it as the first option.

Shall look it up. Thank you so much!!