Cannot publish in HTML or SWF

Help!!! I just found that flash is not supported…what is the workaround to publish then? Is there an update to Captivate 9. I have a training that I need to get out. When I try to publish to HTML only I get the message: Count Not Copy Folder to …assets. What is the assets folder? Is this a folder that I need to create? Thank you for your time.

Captivate 9

I am trying to publish and get “Publish Failed”.  I am not sure what the issue is.  I have published many things prior to this today.