Drag and Drop error

I created a drag and drop question, and for some reason when I preview the slide, and I drop all of the correct answers on the correct targets, I get the message, "Invalid Answer.  You must complete the question before submitting." 

I even tried answering the question incorrectly, same message.  I verified that the Q's and A's were correct in the Edit box, and now I'm not sure what else to try.

Thanks!

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