Web Part Error: One of the properties of the Web Part has an incorrect format. Windows SharePoint Services cannot deserialize the Web Part. Check the format of the properties and try again.

Error Details:
[WebPartPageUserException: One of the properties of the Web Part has an incorrect format. Windows SharePoint Services cannot deserialize the Web Part. Check the format of the properties and try again.]
  at Microsoft.SharePoint.WebPartPages.WebPart.ParseXml(XmlReader reader, Type type, String[] links, SPWeb spWeb)
  at Microsoft.SharePoint.WebPartPages.WebPart.ParseCompressed(SPWebPartManager manager, XmlNamespaceManager xmlnsManager, Byte[] personal, Byte[] global, String[] links, Type type, SPWeb spWeb)
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartSerializer.SerializedWebPart..ctor(SPWebPartManager webPartManager, XmlNamespaceManager xmlnsManager, Byte[] sharedData, Byte[] userData, String[] links, Type type, SPWeb spWeb)
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartSerializer.Deserialize(SPWebPartManager webPartManager, XmlNamespaceManager xmlnsManager, Byte[] userData, Byte[] sharedData, String[] links, Type type, SPWeb spWeb)
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)

[Exception: Cannot create XmlSerializers for this Web Part.]
  at Microsoft.SharePoint.WebPartPages.TypeCacheEntry.get_FailedXmlSerializer()
  at Microsoft.SharePoint.WebPartPages.TypeCacheEntry.CheckFailedEntry(XmlSerializer& xmlSerializer)
  at Microsoft.SharePoint.WebPartPages.TypeCacheEntry.get_XmlSerializer()
  at Microsoft.SharePoint.WebPartPages.WebPart.ParseXml(XmlReader reader, Type type, String[] links, SPWeb spWeb)