Hey Zoltan!
First of all, thank you for the purchase!
The issue you are talking about is a known bug, please accept my apologies for this one. All you need to do to remove the message is download this archive from my file repository, unpack it, and upload via FTP to the following folder: wp-content/themes/Fuji/includes/twitter-widget/, replacing the existing file.
Should you have more questions or comments, do not hesitate to approach me, I’ll be glad to help!
Best,
Andrew | Satori