Dear Support,

I do not understand what it means: "This question requires a second answer set, but none was specified."
My survey seems to be completed with all the answers options.

I am looking forward to your reply!

Kind regards, Anastasiya

This is user to user forum. Just in case you expect customer support.

To your question. You seem to have a question with a question type which needs more than one answerset. So check your questions for missing answersets.