Thanks for posting.
As the message states, the DDR is running into an invalid character somewhere within your database like at the end of a calculation. This is usually caused by something that's been copied and pasted. If you're able to find and delete this character, the message should go away.
Our Development and Quality Assurance departments are currently aware of this issue. I've attached your post to the original report and will keep this thread updated with new information as I receive it.
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 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