There are a few things you can do try:
Notesnook Web Clipper shows this error when it cannot clip a web page for various reasons. Usually you’ll see this error on browser default pages like the new tab page, extensions page etc.
However, if you are seeing this on a website it is recommended that you trigger a page reload. This will reinitialize the web clipper & hopefully proceed.
Since the Notesnook Web Clipper is still in alpha-beta stage, some rendering issues are expected in the web clips. If you notice any such problem, feel free to open a new issue on our GitHub Issue Tracker.