Hi
Not an error. asking permission to go online, what a well-behaved rufus. it is normal.
press Yes for success. after the rufus application is upgraded to current.
another thing that is normal is for rufus to offer to upgrade to the latest version when it is run; first it advises of updates available. So i am guessing that you are on a pc from eight years ago that is not online?
get the recent rufus verson to succeeed with the recent antiX iso.