Silly question…. what is “edium”?

Sorry, pretty new at this, I’m slowly figuring out how to get all of these tags, characters, etc to work together, but I keep getting pages that say “edium“. What is it, how do I fix it?

I’m making test pages so I can get everything ready before I actively start posting pages so everything works properly. I want it so visitors can click on a characters name to see what pages that character has appeared in. Am I using that feature correctly?

The page I need help with: [log in to see the link]