Xamarin.Forms iOS build error Object reference not set to an instance of an object

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I currently created a new Xamarin.Forms project using VS 2019 in my PC, installed some nuget packages and after building the project i got .nugetpackagesxamarin.build.download{$content}.10.0buildTransitiveXamarin.Build.Download.targets(52,3): error : Object reference not set to an instance of an object. from the iOS project.

I checked the Error log file attached to my repo folder in my PC i saw the below error

Date:2021-07-02 07:10:23,580
Thread:[1]
Level:ERROR
Logger:Syncfusion.Xamarin.UI.MainViewModel                         [(null)]
Message:System.NullReferenceException: Object reference not set to an instance of an object.
   at Syncfusion.Xamarin.UI.MainWindow.ItemCheckBox_Unchecked(Object sender, RoutedEventArgs e)

Also, i have done a lot builds, rebuild, clean solution, restore nuget, and i had to uninstall the prelease versions of the nuget packages and installed the latest stable versions yet nothing changed.

Please does anyone have a solution to this? Please help out

Source: Xamarin.ios Questions

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