Class still has open windows.

Details
Product: Windows Operating System
Event ID: 1412
Source: Kernel
Version: 5.0
Component: System Resources
Symbolic Name: ERROR_CLASS_HAS_WINDOWS
Message: Class still has open windows.
   
Explanation

An application, as part of its user interface, has tried to unregister a class of windows, but there is at least one window of that class open in the user interface.

   
User Action

Contact the supplier of the running application.

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