remove view engine

backend/express.js

@@ -39,7 +39,7 @@ alexaApp.express({
 // now POST calls to /test in express will be handled by the app.request() function
 
 // from here on you can setup any other express routes or middlewares as normal
-
+app.set("view engine", "ejs");
 alexaApp.launch(function(request, response) {
   const skill = db.collection('skill_list').findOne({_id: ObjectID(skillDbID)}, (err,result)=>{
     if (err){