Recently, I have been encountering "Runtime Error" mostly when trying to open pages listed under the Toon Ranking tab and browsing for a given realm. Ex. http://www.guildox.com/go/g.aspx?r=Kilrogg-EU&w=&a=15
The description of the error says: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.
I received the same error yesterday when I tried to open this General Forum page. It seems it is fixed now.