Hi,
I am trying to make a digital asset that has a paint functionality. I have used the below code in the button callback script and when I click the button to use the script, the follow error pops up
.

I am using a MacBook Pro with High Sierra
and Houdini Apprentice 16.5.405
.
I have attached the digital asset as well as the hip file.

Any help will be appreciated. Thanks.

Attachments:
Screen Shot 2018-04-10 at 21.43.31.png (339.2 KB)
Paint.hipnc (63.5 KB)
Screen Shot 2018-04-10 at 21.42.34.png (81.0 KB)
nikithaanngeorge_test_paint.hdanc (4.1 KB)
Screen Shot 2018-04-10 at 21.37.56.png (219.3 KB)