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Web Part Error: An error occurred while setting the value of this property: Microsoft.SharePoint.WebPartPages.DataFormWebPart:DataSourcesString - Exception has been thrown by the target of an invocation. Correlation ID: c6b447a2-d279-e027-86bb-b7025978373d.

Error Details:
[WebPartPageUserException: An error occurred while setting the value of this property: Microsoft.SharePoint.WebPartPages.DataFormWebPart:DataSourcesString - Exception has been thrown by the target of an invocation.]
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.ApplyPropertyState(Control control)
  at Microsoft.SharePoint.WebPartPages.BinaryWebPartDeserializer.Deserialize()
  at Microsoft.SharePoint.WebPartPages.SPWebPartManager.CreateWebPartsFromRowSetData(Boolean onlyInitializeClosedWebParts)