try without builder
@@ -5,6 +5,7 @@ load_subconfig(os.path.join(here, 'binderhub_config.py'))
c.BinderHub.base_url = '/services/binder/'
c.BinderHub.auth_enabled = True
c.BinderHub.use_named_servers = False
+c.BinderHub.builder_required = False
# configuration for service authentication
c.HubOAuth.api_token = c.BinderHub.hub_api_token
