According to Strange XmlSerializer error:
This exception is a part of the
XmlSerializer’s normal operation. It
is expected and will be caught and
handled inside of the Framework code.
Just ignore it and continue. If it
bothers you during debugging, set the
Visual Studio debugger to only stop on
unhandled exceptions instead of all
exceptions.
Its probably being caused based on your exceptions that you are choosing to monitor.
Can you tell me how your exceptions are setup: Debug -> Exceptions
If you uncheck the “Thrown” checkbox for the BindingFailure under the Managed Debugging Assistants the exception should go away. Or if you dont want to do this, you can just continue since this exception is by design