Hiya, yes I know what it could be. That’s a script I made a looong time ago, it uses an old Twitch API endpoint, which is going to be removed soon: Legacy Chatters endpoint shutdown details and timeline - April 2023 - Announcements - Twitch Developer Forums
The new, updated endpoint requires authentication from the broadcaster or mod of the channel. I’m not sure yet if or how I will update this script. So it will stop working completely soon, until I update it, or maybe someone else in the community will build a new updated version of this custom API.
I’ll update the ‘empty viewer list’ error message soon.
For now there is no fix for this, sorry!