JavaScript Buffer method gives TypeError b is undefined

leostmark

I’m looking for some help with the buffer tool in the JavaScript API.  I have looked online but with no success.  I am getting a Latitude, a Longitude and a buffer distance from the user then attempting to buffer this point.  This is a custom widget that I'm creating in the Esri Web AppBuilder Developer Edition.

Here’s my code snippet.

var dblLat = domAttr.get(this.inputLat, 'value');

    var dblLong = domAttr.get(this.inputLong, 'value');

    if (dblLat =="" || dblLong =="" || isNaN(dblLat) || isNaN(dblLong)) {

     new Message({message: this.nls.notANumber});

     return;

    }

    if (this.pointLayer){

     //Remove old point layer from map.

     this.map.graphics.remove(this.pointLayer);