update

api/urls.py

@@ -25,6 +25,7 @@ api = NinjaAPI()
 
 api.add_router("account/", "account.api.router")
 api.add_router("tutorial/", "task.tutorial.router")
+api.add_router("challenge/", "task.challenge.router")
 api.add_router("submission/", "submission.api.router")
 api.add_router("upload/", "utils.upload.router")