[Mediawiki-l] Problem with export feature

[Addady]

Hi,

When trying to export a page on my wiki using special:export
I am getting the following message:

"The XML page cannot be displayed
Cannot view XML input using style sheet. Please correct the error and 
then click the Refresh button, or try again later.
--------------------------------------------------------------------------------
An invalid character was found in text content"

I don't know where the problem is. I thought it could be some char on my 
page that is causing it, but I tried to export a bunch of other pages as 
well.

Please help
Addady