nvd3 multiBarChart not showing x axis - nvd3.js

Question

Hi i tried to create a nvd3 multibarchart but i can't get x-axis display.
I searched online but cannot find a solution to my issue.
here is complete code please help. i also attached a pix for output. Thanks!
<script>
function data0() {
var a0 = [],
a1 = [];
a0.push({ x: 1, y: 5065});
a0.push({ x: 2, y: 11464});
a0.push({ x: 3, y: 200});
a0.push({ x: 4, y: 100});
a0.push({ x: 5, y: 0});
a0.push({ x: 6, y: 0});
a0.push({ x: 7, y: 100});
a0.push({ x: 8, y: 2200});
a0.push({ x: 9, y: 2200});
a0.push({ x: 10, y: 0});
a0.push({ x: 11, y: 0});
a0.push({ x: 12, y: 0});
a0.push({ x: 13, y: 0});
a0.push({ x: 14, y: 0});
a1.push({ x: 1, y: 148});
a1.push({ x: 2, y: 2966});
a1.push({ x: 3, y: 1200});
a1.push({ x: 4, y: 79});
a1.push({ x: 5, y: 0});
a1.push({ x: 6, y: 0});
a1.push({ x: 7, y: 0});
a1.push({ x: 8, y: 2185});
a1.push({ x: 9, y: 2185});
a1.push({ x: 10, y: 0});
a1.push({ x: 11, y: 0});
a1.push({ x: 12, y: 0});
a1.push({ x: 13, y: 0});
a1.push({ x: 14, y: 0});
return [
{
values: a1,
key: 'Queue',
color: '#04B45F'
},
{
values: a0,
key: 'In Progress',
color: '#DBA901',
area: true
}
];
}
nv.addGraph(function () {
var chart = nv.models.multiBarChart()
.margin({ left: 65, right: 40, bottom: 45 })
.stacked(true)
.showControls(false)
;
chart.xAxis
.axisLabel("Daily")
.rotateLabels(0)
.tickValues([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14])
.tickSize(12)
.showMaxMin(false)
.tickFormat(function (d) {
var _tools = ["", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N"]
return _tools[d]
});
chart.yAxis
.axisLabel("Number of[enter image description here][1]")
.tickFormat(d3.format(',.0f'));
d3.select('#BarChart-Cell svg')
.datum(data0)
.transition()
.duration(500)
.call(chart)
;
nv.utils.windowResize(chart.update);
return chart;
});
</script>
[ http://i.stack.imgur.com/HNNJf.png ]