When I copy a shape in my application and then attempt to paste it, I get the error shown in the attachment.

Transcribed:
The Paste transaction FailedRolledback
Error Log:
1. Paste failed on a single node: Object reference not set to an instance of an object.

Can someone give me hint for where to start looking for what I've done wrong?

Thanks,
Herb.

I had the same problem and I had added ExpandableObjectConverter to my class. As soon as I removed it, all is well