Correct way to use IWCanvas

[MJS@mjs.us]

I haven't used TIWCanvas (I use a <canvas> tag in a template instead) but I get the below error when I try to get a png to draw using a TIWCanvas:

(index):147  Uncaught TypeError: IW.DOM.dataUrlToCanvas is not a function
    at Initialize ((index):147:83)
    at HTMLDocument.<anonymous> ((index):612:23)
Initialize @ (index):147
(anonymous) @ (index):612