Occurs when a feed folder event error occurs.
Returns S_OK if successful, or E_NOTIMPL.
The IXFeedEvents::Error and IXFeedFolderEvents::Error events are raised when something unexpected happens in the eventing subsystem, such as running out of memory. This event also executes when any of the event sink handlers return an HRESULT that is neither S_OK nor E_NOTIMPL. The application assumes that it did not receive all events and handles this case by running the same code as when it is launched.