JS事件提示：Cannot read property 'points' of undefined，是缺少了什么文件吗？完整JS如下：

var vanchart = FR.Chart.WebUtils.getChart('A2').vanCharts.charts[0],  

openAutoTooltipCarouselDelay = 2000;  

openAutoTooltipCarousel();  

function openAutoTooltipCarousel(ele){  

var series = vanchart.series; 

var points = series[0].points,   

pointsLen = points.length;  

var pointIndex = 0;  

window.openAutoTooltipCarouselTimer = setInterval(function (){  

vanchart.showTooltip(points[pointIndex]);  

pointIndex < pointsLen - 1 ? pointIndex++ : pointIndex = 0;  

}, openAutoTooltipCarouselDelay)  

}