I am getting this error when trying to accept the best answer:

"Error occurred while saving. You cannot accept your own answer as best answer."

1. The question was asked by a registered member
2. I was the first to submit an answer
3. The person who asked the question then answered it correctly (2nd answer)
4. I try to accept the answer and get this error message.

Is this happening because the person who asked the question also answered it?

Thank you.