Uncaught TypeError: Type error

[Panda-ref]

I have made "How to run the Demo?", and cant do anything with it, after starting server i see the demo page, when i try to upload somth i have a error in chrome console:
Uncaught TypeError: Type error imageupload.js:51
resizeImage imageupload.js:51
(anonymous function) imageupload.js:89
image.onload

in imageupload.js:
ctx.drawImage(origImage, 0, 0, width, height);
Uncaught TypeError: Type error