When I drag to copy an artboard it creates a new artboard. So when i try to export that new artboard it shows error and says it doesn't exist.
It also happens the new artboard to have number that already exists.
I am closing the ticket due to lack of response.
Please get in touch with us at firstname.lastname@example.org or any of the other support channels – helpx.adobe.com/support.html . Please give a reference to this post so that we can identify you.