Error in XML document (0, 0)

Feb 9, 2012 at 4:22 PM

Hi, I created a dll with the vsto2010 for excel 10, worked perfectly with exceldna.
I had to format and reinstall everything because I had a problem
Now when I load the XLL file gives me this error

There was an error during processing of C:\Documents and Settings\Userr\Desktop\exceldll\ExcelDnadll.dna:
There is an error in XML document (0, 0).
The type initializer for 'System.Xml.Serialization.XmlSerializationReader' threw an exception.

I do not understand why now is not working