Error upon loading Uncaught TypeError: Cannot read property 'width' of null

[GoogleCodeExporter]

<script type= "text/javascript" src="js/Detector.js"></script>
  <script type= "text/javascript"src="js/jsc3d.js"></script>
  <script type= "text/javascript"src="js/jsc3d.touch.js"></script>
 <script type= "text/javascript" src="js/jsc3d.webgl.js"></script>

<script type="text/javascript" id="virg">

var canvas= document.getElementById('virgin');
var viewer= new JSC3D.Viewer (canvas);

     viewer.setParameter('SceneUrl', 'virg.obj');
     viewer.setParameter('InitRotationX', 0);
     viewer.setParameter('InitRotationY', 0);
     viewer.setParameter('InitRotationZ', 0);
     viewer.setParameter('BackgroundColor', '#FFFFF');
     viewer.setParameter('RenderMode', 'texturesmooth');
     viewer.setParameter('SphereMapUrl', 'images/black.png');
     viewer.setParameter( 'Renderer', 'webgl');
     viewer.init();
     viewer.update();

        var ctx = canvas.getContext('2d');


    function changeDefinition(definition) {

                    if(definition == 'high' && viewer.isWebGLEnabled() && JSC3D.PlatformInfo.browser == 'chrome')
                    definition = 'standard';

                viewer.setDefinition(definition);
                viewer.update();
            }
</script>
What is the expected output? What do you see instead?
 I expect to have my obj loaded. in my console it says 
Uncaught TypeError: Cannot read property 'width' of null 
jsc3d.js:95

and anonymous function in my index referring to the .viewer

What version of the product are you using? On what operating system?

jscd 1.6.5

Original issue reported on code.google.com by [email protected] on 27 Feb 2015 at 11:01

[GoogleCodeExporter]

I am wondering what can i do to remedy the situation. It says the issue is in 
the jsc3d.js line 95 that sets the parameters for this.frameWidth = 
canvas.width;  

Original comment by [email protected] on 27 Feb 2015 at 11:04

[GoogleCodeExporter]

Not sure. It sounds like incorrect reference binding. How did you use the 
viewer instance? Have you checked whether the canvas object you passed to the 
viewer refered to a valid canvas element?

Original comment by [email protected] on 28 Feb 2015 at 4:05