[BUG]: Unable to publish lesson about oppia HOT 4 CLOSED

I think the following things might solve the issue.

1. I think it is giving you a warning there try reducing the cards and try it once.
2. Try clearing browser cache
3. wait for some time there might be some issue with the server

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@Kebith The issue here is that one of the item selection interactions has a duplicate rule. Could you check to see whether this is the case and try removing the duplicate?

Also @nikitaevg just to check, this should be fixed in develop already, right? (We've already started the Dec release so hopefully those changes will go out soon.) Thanks!

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Yeah, these have been fixed in

1. Show the warning on the front end in here
2. Prevent indefinite publishing in here

As Sean mentioned, this will be released soon, and should be fixed by then.

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Update:

By checking through the checkbox interactions in the lesson (as advised by @seanlip), I noticed in one of them, the third answer group is a duplicate. When I resolved this, I was able to publish the lesson successfully.

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