XHTML error editing a wikipage
I am trying to add a page to my wiki, but when I tried to save it, I received the error:
1 error prohibited this page from being saved
There were problems with the following fields:
Text XHTML end tag does not match start tag Element
Obviously, I am not doing any XHTML, so what's going on here? Are there any characters I'm not allowed to use? And if so, why doesn't the error message say so?