Missing plugin error when using Adobe Illustrator

hi experts,
I was using Adobe Illustrator when I got this error message, see below. I searched the web and saw the Adobe website that offered several solutions to the problem. I tried each one but still the error occurred. I turned to this forum because I trust that experts here might give me a better solution.
Please help. Thanks.

Adobe Illustrator
Missing required plugin.
BRS Pencil Tool ExpandS
