"An extension with that UUID has already been added"

Hi, I’m trying to upload my first gnome extension which is basically MaximizeToEmptyWorkspace but forked for Gnome 50 (I changed one line to get it working). When I upload it, I get the message in the title and it also doesn’t show up as pending. Did I miss something?

You should pick a different UUID if you want to release it on EGO.

We already have a few inactive forks of this extension on EGO. Please only submit it if you are willing to maintain it for bug fixes and future GNOME Shell releases.