Google redirect_uri_mismatch auth

my backend running on localhost:8000 front end running on localhost: 3000 here's my google redirect uri added this in front end = BETTER_AUTH_URL=http://localhost:8000/ after login its routing to backend {"path":"http://localhost:8000/","message":"NOT_FOUND","data":null,"timeStamp":"2025-03-26T18:40:58.392Z","status":200,"code":"NOT_FOUND"} how to fix this error