18 hours ago, Skizzerz said:The "wiki ID" is a fancy term for "the name of the database where the wiki lives." So, something in your configuration is not setting the database name and/or database prefix correctly for this wiki. My guess has to do with the fact that it's a double subdomain "en.en" and your mapping of subdomain to database name is not changing that period to something else -- periods are not valid in database names or table prefixes.
My wiki has a double subdomain because the single "en" subdomain redirects to the main wiki when I click on the wiki directory. Even the domain penguingamestudio.com gives the same error when you click on mw19. If the double subdomain works, then how am I supposed to determine the wiki ID?