I'm having the exact same issue, have you found a workaround yet?

Hmm, this is very odd. Did you copy the Playground after this error happened or did you manage to make a backup?

No, under no circumstances will your Playground be able to access the internet. I think this is mostly for security purposes.

Did you use the Playgrounds app on MacOS to build the project? or did you use Xcode? If you used the Playgrounds app then it is automatically cross-platform with iPadOS. Also, you cannot run a Swift Playground on iOS (yet).

What code file? I can't find any file to edit in my .playgroundbook file. Also I am on Mac, so any help on how to edit the original .swift file would be very much appreciated.

I know this is an old question, but my solution was to just insert an EmptyView() at the bottom of the list. Hope this helps.