twitter

Hi, I have gone through twitter integration before and used pretty much the exact same code as below (only difference is now i am adding info to a list as opposed to a table). I am getting a response saying that it could not authenticate me. I am wondering if there is something which I am forgetting? I have set up my app on the twitter developer console as normal.I am usong titanium classic 3.4 sdk. Testing on simulator, iphone 4s and iPhone 6. Code below:

var Codebird = require("ui/handheld/codebird");
    var cb = new Codebird();
 
    cb.setConsumerKey('KeyIsRight', 'KeyIsRight');
 
    cb.setToken('KeyIsRight', 'KeyIsRight'); 
 
    var bearerToken = Ti.App.Properties.getString('TwitterBearerToken', null);
 
    var twitterSection = Ti.UI.createListSection({
        headerTitle:'Twitter'
    });
 
    var twitterDataSet = [];
 
    function fetchTwitter(){
 
        var rowData=[];
        var data = [];
 
        if (Titanium.Network.online){
            cb.__call(
            'statuses_mentionsTimeline',
 
            function (reply) {
                //console.log(reply);
                if(typeof reply[0]!=='undefined')
                {   
 
                    for (var i=0;i<10;i++){ 
                         twitterDataSet.push(   
                            {info: {text: reply[i].text}, 
                            es_info: {text: reply[i].user.name}, 
                            pic: {image: reply[i].user.profile_image_url},
                            properties:{height:'60dp'}
                         });
                    }
 
 
                    sections.push(twitterSection);
                    Mylist.setSections(sections);
                    self.add(Mylist);
 
                }  
                else {
                    //console.log("Sorry. Twitter is not available");
                    Mylist.setSections(sections);
                    self.add(My_list);
                }
 
            },
            true // this parameter required
        );
 
    } // From the IF
 
    else {
            alert("Connect to the internet before twitter");
    }
 
}