System.Reflection.TargetInvocationException; need

Question

What does this exception mean, and what can i do to fix it?

Answer 1

From MSDN:

The exception that is thrown by methods invoked through reflection. This class cannot be inherited.

Try to see what the InnerException says or take a look at the StackTrace to see what happens.

EDIT: Looking at your StackTrace it seems that occurs a problem while creating an element in your XAML. Check InnerException as said before to have more informations.