"No route found for the specified format html" with 8.5.1

I encountered this error and will add a note here in case anybody else has the same cause as I did.

I created a new data export display on a view, where the other displays were pages and blocks, using the +Add -> Data Export link. I set up my view including the path with the .csv in the filename, then kept getting the error.

Then I discovered in Format -> Format -> Settings there is also an option there to set the accepted request format. That also needs to be set to csv.

Yeah, as @ryanrobinson_wlu says the issue here is that you need to manually select an output format, but the module doesn't enforce that, and it should. Let's add that and then this error will go away.