Signature Pad in xml view

Hi,

I've refer a few blogs on creating signature pad in my sapui5 app.

However, I'm facing below error when tried to run the app. I've imported the 3rd party library from signature pad library but still fail to launch it. Any advise on enlighten me to tackle this error?

SAPUI5: Digital Signature Pad

Signature Capture Control in SAPUI5 using HTML5 Canvas

sample signature pad

Thanks.

Regards,

Ben