Error

Web Part Error: A Web Part or Web Form Control on this Page cannot be displayed or imported. The type Appointment_Application.VisualWebPart1.VisualWebPart1, Appointment Application, Version=1.0.0.0, Culture=neutral, PublicKeyToken=50b8a7b5455f6c2f could not be found or it is not registered as safe. Correlation ID: e9d71b9e-a9da-e0fa-7277-6de992698ee5.