Uncaught TypeError: Cannot read property 'token' of undefine

//In this code, I am trying to do when the value of ajax refresh_token function changed the Orderlist function should call. But I am not able to do this.



//Section 1 Starts Here
var Orderlist = React.createClass({

        Order_list: function(){
                                $.ajax({
                                        type: 'GET',
                                        url: "/order/list/10/1",
                                        headers: {
                                        Accept : "application/json",
                                                     "Content-Type": "application/json"
                                                },

                              success: function(orderlist) {
                                //      console.log(orderlist);
                                //      console.log(this.state.orderlist);

                                this.setState({orderlist: orderlist}, function(){
                                  console.log(this.state.orderlist);
                                }.bind(this));

                                }.bind(this),
                                error: function(xhr, status, err) {
//                              console.error(this.props.url, status, err.toString());
                                }.bind(this)

                                        });
                                },

	getInitialState: function(){
                                return{
                                        orderlist : []
        	                        };
                                  },

	componentDidMount: function(){
                                        this.Order_list();
                                //        setInterval(this.Order_list, 10000);
                                    },

	render: function(){
                                var orderlist11 = [];
                                for(var ordernum in this.state.orderlist){
                                                        orderlist11.push(<div className="card">
                                                        <div className="title">
                                                        Order Number {this.state.orderlist[ordernum].ordernumber} </div>
                                <div className="content">  Date & Time : {this.state.orderlist[ordernum].bizorderdate} <br />
                                 Username : {this.state.orderlist[ordernum].userid}
                                </div>
                                                                        </div>);


                                                                        }
                                return (
                                        <div >
                                                {orderlist11}
                                        </div>
                                        );
                         }
});

////// Section 1 ends here


var RefreshToken = React.createClass({

	getInitialState : function(){
  					return {
    						token : -1 //Or anything that is not a token.
  						}
				   },

	componentDidMount : function(){

  					setInterval(this.refresh_token, 10000);
				     },

        refresh_token : function(){
                    var self = this;
                    $.ajax({
                      type: 'GET',
                      url: "/order/refresh",
                      headers: {
                       Accept : "application/json",
                       "Content-Type": "application/json"
                      },

                      success: function (resp){
                                 var newToken = resp;
                                     console.log(newToken); //it give the value of refresh eg. ["20150925313"]

                                 if(newToken != self.state.token){

                                   self.setState({ token: newToken});
                                            //      console.log(this.state.resp);
                                 }
                              }
                    });
                },

       shouldComponentUpdate: function(nextProps, nextState) {
                                                           return true;
                 },



        render: function(){

                                var order_list_new;
//                              var token33 = this.refresh_token();
                                var a = this.state.token;
                                 var b = this.state.timenow;
                                console.log(a);
                                console.log(b);

                                var diff = b - a;
                        //      console.log(diff);
                                 if(  diff > 1 )
                                        {
                                                order_list_new =  <Orderlist />;
                                        }


                                 return (
                                        <div>

                                        {order_list_new}
                                        </div>
                                        );
                        }

});


React.render(
  <RefreshToken  />,
  document.getElementById('list_of_orders')
);