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You could try to clear obj and bin folders, make sure Xamarin.forms
is the latest version, check the Android SDK, and create new projects to check if if all new projects have this issue. If this issue still exist, you coud report it to Visual Studio. For more information , you can refer to
https://stackoverflow.com/questions/16590629/error-dump-failed-because-no-androidmanifest-xml-found
https://stackoverflow.com/questions/45021965/could-not-load-file-or-assembly-netstandard-version-2-0-0-0-reference/45886961#45886961
Best Regards,
Wenyan Zhang
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