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This error message typically appears when there is an issue with the XAML code in a WPF or UWP project. It indicates that the XAML parser was unable to parse the XAML markup in the application.
The causes of this error can include:
- Incorrectly formatted XAML code
- Missing or incorrect namespace declarations
- Missing or incorrect assembly references
- Syntax errors in XAML
To resolve this error, you should carefully inspect the XAML code and make any necessary corrections. You may also need to verify that all necessary dependencies are correctly referenced in your project.