This is a known bug. My database indicates this occurs when producing an XML report instead of HTML. Do you need it in XML?
For More Information see: SAXParseException on exporting XML with XSLT specified if the field contains an invalid character.
This is one of many acknowledged bugs that can be found in the Known Bug List thread here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: http://www.4shared.com/file/8orL8apk/FMP_Bugs.html
I am not using XML. I tried using HTML.