Failed to search view in the views directory for a nodejs app

I try to create my first Node JS project but I can not show the .ejs page that I created in my views directory. In effect I get:

mike@mike-thinks:~/Desktop/Exercises$ node app.js 
*******************************************************************
**    Paris Dauphine - Emerging technologies
**    Server ready for business at http://:::8080
*******************************************************************
OPEN : Page1 : My name is  
Error: Failed to lookup view "/pages/page1.ejs" in views directory "/home/mike/Desktop/Exercises/views"
    at Function.render (/home/mike/Desktop/Exercises/node_modules/express/lib/application.js:580:17)
    at ServerResponse.render (/home/mike/Desktop/Exercises/node_modules/express/lib/response.js:1008:7)
    at /home/mike/Desktop/Exercises/app.js:45:7
    at Layer.handle [as handle_request] (/home/mike/Desktop/Exercises/node_modules/express/lib/router/layer.js:95:5)
    at next (/home/mike/Desktop/Exercises/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/home/mike/Desktop/Exercises/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/home/mike/Desktop/Exercises/node_modules/express/lib/router/layer.js:95:5)
    at /home/mike/Desktop/Exercises/node_modules/express/lib/router/index.js:281:22
    at Function.process_params (/home/mike/Desktop/Exercises/node_modules/express/lib/router/index.js:335:12)
    at next (/home/mike/Desktop/Exercises/node_modules/express/lib/router/index.js:275:10)

With app.js next:

/*
* Emerging technologies
* Paris Dauphine
*
* WARNING :
*   - console.log is used in this example to follow-up progression. Though, It is not a best practice for production apps :-) !
*   - Application here are implemented under the 'happy path' for the sake of clarity. It means that very limited of error traps are made.
*/

/*
express is required along with some iddlewares
- express-session for the Session management
- body-parser in order to parse the bdo of the pages (as json)
*/
var express = require('express')
var bodyParser = require('body-parser')
var session = require("express-session")

//Creates an Express application
var app = express();
//Enable the parser in order to interpret the POST to retrieve data
app.use(bodyParser.urlencoded({ extended: true}));
app.use(bodyParser.json());
app.use(session({resave: true, saveUninitialized: true, secret: 'ThisWillBeOurSecret', cookie: { maxAge: 60000 }}));

var mysession;

//The profile is initialized in the session with a null value if it doesn't already exist

app.use(function(req, res, next){
  mysession = req.session;
  if (typeof(mysession.myprofile) == 'undefined') {
    mysession.myprofile = "";
  }
  if (typeof(mysession.myname) == 'undefined') {
    mysession.myname = "";
  }
  next();
})

////////////////////////////////////////////////////////////////////////////////
//EXPRESS Routes definition
//Express Route : page1
app.get('/page1/', function (req, res) {
  res.render('/pages/page1.ejs',{myname: mysession.myname,myprofile: mysession.myprofile, });
  console.log ('OPEN : Page1 : My name is ', mysession.myname);
});

//Express Route : POST : The profile is updated
app.post('/page1/profile/add/', function(req, res) {
  mysession.myname=req.body.myname;
  mysession.myprofile=req.body.myprofile;
  console.log ('POST Profile updated for : ',mysession.myname);
  console.log ('JSON Content : ',req.body);
  res.redirect('/page1');
})

//Express Route : No route Found : It is a 404
app.use(function (req,res,next){
  res.status(404);
  res.send('404! File not found')
})

// Defining the Server -
var server = app.listen(8080, function () {
var host = server.address().address;
var port = server.address().port;
  console.log('*******************************************************************');
  console.log('**    Paris Dauphine - Emerging technologies');
  console.log('**    Server ready for business at http://%s:%s', host, port);
  console.log('*******************************************************************');

});

The structure of the project is like this

As the screenshot shows, there is page1.ejs in Exercises/views/pages/ . That's why I do not understand the problem