[cfx.Gallery.Surface causes a.bw is not a constructor]

I have a simple code stripped down from the example

 

    function loadChart()
        {
        var chart1 = new cfx.Chart();
        chart1.setGallery(cfx.Gallery.Surface);

        chart1.create(document.getElementById('div_Chart'))

        }

Chrome Console shows:

 

jchartfx.coreBasic.js:200 Uncaught TypeError: a.bw is not a constructor
    at va.aP (jchartfx.coreBasic.js:200:244)
    at va.aR (jchartfx.coreBasic.js:202:316)
    at va.setGallery (jchartfx.coreBasic.js:197:356)
    at f.setGallery (jchartfx.coreBasic.js:570:98)
    at loadChart (jcsChart4.html:34:13)
    at onload (jcsChart4.html:27:28)

 

any suggestions?