- SafeControl entries for the Federated Search Results WebPart have not been added successfully when the SharePoint Connector feature is installed.
SharePoint requires that all custom Web Parts have an entry in the SharePoint site's
web.config that marks the control as 'safe' for use. This step is normally performed by the SharePoint Connector installer, but in some cases it may fail to be configured automatically. See relevant bug report: CSI-642.
Manually add the SafeControl entry to the root
web.config of your SharePoint server(s):