App crashes in Android after listview switchcell change and navigate back

Hello guys, I'm new to Xamarin and Databinding. I'm facing an issue with my project, and need your help or guidance. I've attached the project here.

In the app I like to show a multiselect list to the user on click of a button. Then on "Done" button click I want to know the selected items. I'm using listview with switchcell to do that. In addition, I'm using FreshMVVM and PropertyChanged in the project. As soon as I click Done in the multiselection page it crashes. I need help to figure out what I'm doing wrong. I believe I'm using data binding wrong, which might be causing it, but could not figuere it out. Also may be there is a better option. Please suggest. Thanks in advance all.

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