Troubleshooting Exceptions: System.Reflection.TargetException
The exception that is thrown when an attempt is made to invoke an invalid target.
Remarks
A TargetException is thrown when an attempt is made to invoke a non-static method on a null object. This may occur because the caller does not have access to the member, or because the target does not define the member, or similar circumstances.
See Also
Tasks
How to: Find Out More About an Exception with the Exception Assistant