Using someone elses token generator is not recommended. (I thought all references to this were removed from the documentation actually)
Try the Twitch-CLI instead https://dev.twitch.tv/docs/cli/ or build out the flow for your web app instead
If you are using the Twitch Token Generatior, I don’t believe htttps://localhost:3000 is a valid redirect URI for it.
But it is for the CLI
Either way, this error means the ClientID used doesn’t have the stated URL as a valid redirect.
Also this has too many t’s should be http
Additionall SSL on localhost is a odd thing
Lets go back to the start and get you going with the CLI instead - Configure the Twitch CLI | Twitch Developers