Expressjs passport-local can't logout

I copy pasted the app passport-local on my app,

The fun is I can log in users, but I can't make them logout,

app.get('/logout', function(req, res){
  req.logout();
  res.redirect('/');
});

this is not doing nothing, nothing on the logfiles, and I I have its a link to /logout

this is the main route examples

app.get('/page1', function(req, res){                                                                                                                       
  res.render('page1', {user: req.user});
});

app.get('*', function(req,res){
  res.render('root', {user: req.user});
});

Why the logout its not working ????