Java Script Error Message

Hello,

I’ve rigged a character, added Master Controller and then added a prop with a wrapped envelope deformer with a weight deformer node. The prop only has one drawing.
When I try and reset the position for the prop using the envelope deformer, this error comes up. I’ve followed the location and I’ve looked at the Script Editor and I couldn’t find the problem.

Has anybody had a similar problem like this.
Capture

Please let me know and how I can resolve the issue

Thanks