Web Part Error: A Web Part or Web Form Control on this Page cannot be displayed or imported. The type SiteMapWebPart.WebParts.SiteMapWebPart.SiteMapWebPart, SiteMapWebPart, Version=1.0.0.0, Culture=neutral, PublicKeyToken=c3a3ff3ecf5fc542 could not be found or it is not registered as safe. Correlation ID: 2ab673a1-ebfb-f05f-bf12-adae5b4bd7e1.

Error Details:
[UnsafeControlException: A Web Part or Web Form Control on this Page cannot be displayed or imported. The type SiteMapWebPart.WebParts.SiteMapWebPart.SiteMapWebPart, SiteMapWebPart, Version=1.0.0.0, Culture=neutral, PublicKeyToken=c3a3ff3ecf5fc542 could not be found or it is not registered as safe.]
  at Microsoft.SharePoint.ApplicationRuntime.SafeControls.GetTypeFromGuid(Boolean isAppWeb, Guid guid, Guid solutionId, Nullable`1 solutionWebId, String assemblyFullName, String typeFullName, Boolean throwIfNotSafe)
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)