In Task UI mode, a build view error may occur during navigation in the following two scenarios:
The previous view is not destroyed yet so there is still an active view. In this case, a modal pop-up message is shown to user.
You can dismiss the message, correct the problem, and try to navigate or cancel the task.
The previous view has been destroyed and, therefore, no active view is available. In this case, an HTML page indicating the error is displayed to user.