I am using the Xam.Plugin.FilePicker on xamarin android from https://github.com/Studyxnet/FilePicker-Plugin-for-Xamarin-and-Windows
If user selected an image from the picker, everything is fine. When user cancel or didn't select any of the file, then open the picker again the exception occur.
The package somehow work inside my newly creation project which only have a button and the code for opening up the picker.
The nuget version may have outdated. Used the github version work at the moment.