This error comes up a lot when trying to download a quote from the dashboard. Usually it'll go away on it's own if you try again a few seconds later but sometimes it just seems stuck that way
@BGrennan We produce the downloadable version of the PDF on demand, this means it can take a few minutes for the PDF to become available. The text you were seeing is a bug on our end. It's stating that we don't currently have a version of the text indicating that the PDF is still loading - set for the en-gb locale (English - United Kingdom).
I will let the engineers know so they can get it fixed.