I am trying to call python function from javascript.

Python class:

class message_of_the_day(osv.osv):
   _name = "message_of_the_day"

   def my_method(self, cr, uid, context=None):
    return {"hello": "world")}

Javascript file:

openerp.oepetstore = function(instance) 
{
  instance.oepetstore.MyClass = instance.web.Class.extend(
  {
    hi_start: function() 
    {
      var self = this;
      var model = new instance.web.Model("message_of_the_day");
      model.call("my_method", [], {context: new instance.web.CompoundContext()}).then(function(result) 
      {
        console.log("hello world, I am working");
      });
  },
});
var my_object = new instance.oepetstore.MyClass();
my_object.hi_start();
}

When I run this module, the page stopped loading.

What am I doing wrong here?