This exception indicates a missing annotation or a wrong mapping between class and xml. Maybe the nesting is not correct, a wrong annotation is used etc.
It's hard to say whats the cause here, but put make sure your code looks something like this:
(Pseudocode, not testet!)
@Root(name = "Address")
public class Address
{
@Element(name="Host")
private String mHost;
// more things here ...
}
Can you test your problem on a minimal or show at least how address is implemented? Btw. is always helpful to try the opposite direction: Take a Config
object, serialize it and check if it's constructed as you require.