Add missing service injection...

app/controllers/auth/Oauth2.controller.js

@@ -8,7 +8,7 @@ const Oauth2Controller = require('flitter-auth/controllers/Oauth2')
  */
 class Oauth2 extends Oauth2Controller {
     static get services() {
-        return [...super.services, 'Vue', 'configs', 'models']
+        return [...super.services, 'Vue', 'configs', 'models', 'output']
     }
 
     async authorize_post(req, res, next) {