Class Designer errors
Applies to: 
Visual Studio 
Visual Studio for Mac
Note
This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here
Class Designer does not track the location of your source files, so modifying your project structure or moving source files in the project can cause Class Designer to lose track of the type, For example, it's common to modify the source type of a typedef, base classes, and association types. You might receive an error such as Class Designer is unable to display this type. To resolve the error, drag the modified or relocated source code to the class diagram again to display it.
Resources
You can find assistance with other errors and warnings in the following resources:
- Work with Visual C++ code includes troubleshooting information about displaying C++ in a class diagram.
- Visual Studio Class Designer forum provides a forum for questions about Class Designer.