Here's another tip if you tried everything and it dosent work just left click the roblox icon on your desktop and click run as administrator it worked for me :)
@@gunthervatero on roblox player when i was banned it was just frozen i couldnt do anything on the player so i just had to go on with the browser version
I got this error message after being banned on my main, and now I can't play on any alts on my pc but my sister can play on the alts. I got a 1-day ban, will this error disappear after the 1-day ban is over?