I would love to fix it but as it seems, it's just a URL with an invalid char, namely '|'. The problem persists with any other illegal char. Was there some content before (shall I restore it) or how you got to this weird URL?
I threw a look into it now and it is, without a doubt, a plain copy-paste from an old Wikipedia version of the article on Congress, with additional < nowiki > tags so it didn't render properly. My advice is to delete that content and redir to Wikipedia :)