How to debug Java.Lang.NoClassDefFoundError

Hi,

I am getting:

Unhandled Exception:

Java.Lang.NoClassDefFoundError: occurred

I added too many breakpoints but the app is not reaching there.

I added a break point in the first line in App.xaml.cs:

InitializeComponent();

and in Android's MainActivity:

LoadApplication(new App());

How can I debug this please?

here is my output log:

https://www.softnames.com/temp/OutputError.txt

Thanks,
Jassim