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This error message indicates that there is an issue with the conversion of XAML markup to object instances during the runtime of a .NET application. Specifically, the TypeConverterMarkupExtension class, which is responsible for converting object types from XAML markup to their corresponding .NET types, has thrown an exception. This could be caused by various issues, such as incorrect or invalid markup, missing assemblies or references, or issues with the TypeConverter implementation for a specific type being used in the markup.