Web Part Error: A Web Part or Web Form Control on this Page cannot be displayed or imported. The type NewsDetailWebpart.VisualWebPart1.VisualWebPart1, NewsDetailWebpart, Version=1.0.0.0, Culture=neutral, PublicKeyToken=a1b234e2fae623b0 could not be found or it is not registered as safe. Correlation ID: 6dc125a1-78fa-b05a-5101-34821ac81fdc.

Error Details:
[UnsafeControlException: A Web Part or Web Form Control on this Page cannot be displayed or imported. The type NewsDetailWebpart.VisualWebPart1.VisualWebPart1, NewsDetailWebpart, Version=1.0.0.0, Culture=neutral, PublicKeyToken=a1b234e2fae623b0 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)