So this is the first time I try to make a twitch expension. I tried to make a new project but everytime I make a new extension I get the error that the name is already taken but with EVERY name I try.
Is there a fix?
Maybe you use reserved words like Twitch or so. Is there such a buzzword in your names?
If you are trying to use the developer rig, it is depreacted, and will return this error but will partially create the extension.
Please use the developer console to create and manage extensions - Twitch Developers
You’ll find all the things you tried exist but are incomplete. See also End of support for the Twitch Developer Rig for the information and alternative tools