Web Clipper error "Vault not found"

What I’m trying to do

Clip web pages into Obsidian using web clipper. When I do so, I get an error message saying “Vault not found. Unable to find a vault for the url.” However, I have checked that the vault location is correctly specified in the web clipper. Have tried specifying using both prose title and file location address forms.

Things I have tried

I changed the title to specify the problem (was “Obsidian web clipper help needed”).