Unable to publish to rpubs: "We're sorry, but something went wrong."

plotly

#1

I'm trying to publish a plotly presentation to rpubs and it seems to upload ok. However, after completing the description and slug etc. it then takes me to a stark error page saying simply:

We're sorry, but something went wrong.

There is no indication of what went wrong from this end. The presentation works ok locally.

Can anyone help me please?