Failed to create a 'System.Windows.Input.ICommand' from the text 'CancelCommand'.

This might wont happen to users regularly. This is because of a silly mistake while binding the Command attribute;
e.g.

<button content="Cancel" command="CancelCommand">

The above statement is wrong as you can see the CancelCommand is not binded; instead it is just added as a value;

The correct statement is as follows

<button content="Cancel" command="{Binding Path=CancelCommand}"/>

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