A ‘Binding’ can only be set on a DependencyProperty of a DependencyObject

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As a side note, it is also worth noting that you will get these binding errors if you copy and paste between objects and forget to change the second typeof(Object) statement.

I couldn’t figure out for a good hour why I was getting this error as everything appeared to be defined and correct. I’d moved my properties into a usercontrol as I wanted to go from a single set to a list. Thus:

public static readonly DependencyProperty FoldersProperty = DependencyProperty
    .Register("Folders", typeof(OutlookFolders), typeof(MainWindow),
    new FrameworkPropertyMetadata(new OutlookFolders()));

public OutlookFolders Folders
{
    get { return GetValue(FoldersProperty) as OutlookFolders; }
    set { SetValue(FoldersProperty, value); }
}

Should have become:

public static readonly DependencyProperty FoldersProperty = DependencyProperty
    .Register("Folders", typeof(OutlookFolders), typeof(SavedFolderControl), 
    new FrameworkPropertyMetadata(new OutlookFolders()));

public OutlookFolders Folders
{
    get { return GetValue(FoldersProperty) as OutlookFolders; }
    set { SetValue(FoldersProperty, value); }
}

Until I did this change I kept receiving the error:
A 'Binding' cannot be set on the property 'Folders' of type 'SavedFolderControl'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject.

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