Troubleshooting Exceptions: System.DirectoryServices.Protocols.DsmlInvalidDocumentException 

The exception that is thrown when a DSML (Directory Services Markup Language) request or response document is not well-formed XML, or cannot be validated with DSMLV2 schema.

See Also

Tasks

How to: Find Out More About an Exception with the Exception Assistant
DSML Exception Handling Technology Sample

Reference

DsmlInvalidDocumentException