MRefBuilder invalid character exception on SandCastle

I'm trying to use the Sandcastle Help File Builder to generate a help file for my assembly. When I run the build I get the following error:

 MrefBuilder (v2.4.10520.1)
  Copyright c Microsoft 2006
  Info: Loaded 1 assemblies for reflection and 15 dependency assemblies.

  Unhandled Exception: System.ArgumentException: '', hexadecimal value 0x02, is an invalid character.
     at System.Xml.XmlEncodedRawTextWriter.InvalidXmlChar(Int32 ch, Char* pDst, Boolean entitize)
     at System.Xml.XmlEncodedRawTextWriter.WriteAttributeTextBlock(Char* pSrc, Char* pSrcEnd)
     at System.Xml.XmlEncodedRawTextWriter.WriteString(String text)
     at System.Xml.XmlEncodedRawTextWriterIndent.WriteString(String text)
     at System.Xml.XmlWellFormedWriter.WriteString(String text)
     at System.Xml.XmlWriter.WriteAttributeString(String localName, Str开发者_如何学Cing value)
     at Microsoft.Ddue.Tools.ManagedReflectionWriter.WriteTypeElements(TypeNode type)
     at Microsoft.Ddue.Tools.ManagedReflectionWriter.WriteType(TypeNode type)
     at Microsoft.Ddue.Tools.ManagedReflectionWriter.VisitType(TypeNode type)
     at Microsoft.Ddue.Tools.Reflection.ApiVisitor.VisitTypes(TypeNodeList types)
     at Microsoft.Ddue.Tools.Reflection.ApiVisitor.VisitNamespace(Namespace space)
     at Microsoft.Ddue.Tools.ManagedReflectionWriter.VisitNamespace(Namespace space)
     at Microsoft.Ddue.Tools.Reflection.ApiVisitor.VisitNamespaces(NamespaceList spaces)
     at Microsoft.Ddue.Tools.ManagedReflectionWriter.VisitNamespaces(NamespaceList spaces)
     at Microsoft.Ddue.Tools.Reflection.ApiVisitor.VisitApis()
     at Microsoft.Ddue.Tools.MRefBuilder.Main(String[] args)

I also get this error when running from the command line.

I've used a hex editor to examine the Documentation.xml that VS outputs, and there is not a character 0x02 in the file.

Does anyone have any clue or advice?

Thanks

It appears to be related to a DLL that I had to use to connect to SAP. ERP Connect. Once I eliminated that namespace, everything went well.