AsEnumerable is not a member of 'System.Data.Datatable'

[loginerror (Maciej Kuźmicz)]

Hi @lucas.mcgonagle

EDIT
20.10 fixed this issue for newly created projects.

You can fix it by adding the Assembly Reference manually in your xaml file:

Simply open the file in Notepad and create new line with this String:
<AssemblyReference>System.Data.DataSetExtensions</AssemblyReference>

Then reopen your project and the error should be gone.

Please be careful while doing so and always keep a backup.