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Setting up a Grid Layout in XAML to contain elements that are only added at run time (creating a placeholder), creates the exception:
Xamarin.Forms.Xaml.XamlParseException: Position 41:22. Property Content is null or is not IEnumerable
It should be possible to setup the layout with rows and columns to reserve space in XAML without the need to put a control in the layout prior to inflation.
This was seen debugging on Android. Did not verify on other platforms.
After further testing this was caused by a ScrollView having two children instead of one. Misleading error message and lack of designer resulted in a bad bug submission. Sorry.