Here is an example exception: Types 'Telerik.Windows.Diagrams.Core.SelectionMode' and 'System.Windows.Controls.SelectionMode' both use the XML type name, 'SelectionMode', from namespace ''. Use XML attributes to specify a unique XML name and/or namespace for the type.
As a workaround, you can exclude the property with the repeating name as demonstrated in Example 4 in the following article: Serialization Options