When trying to create a new show wiki where one doesn't previously exist, I'm getting the "Oh Snap" error if I use the 'Editor Wiki' link in a show's drop down menu. For instance, the link for Marvel's Runaways.
This is just for when a wiki doesn't yet exist, as show's with a wiki are working fine, like the one I just created for Gold Diggers. This is how I discovered the error, as I had to create it the old way :)