Clojurians Log v2

Hi - I'm trying to use Clerk to create some plots using plotly.js. I have the 'Download plot as png' button at the top of my plot, but when I click it I get an error - nextjournal.clerk/show! cannot show nil - {:file-or-ns nil}. Does anyone know what this is? Is there a parameter I should provide? (I basically need to download each plot as png so I can use it in a blog post)