Connect to Outlook in sharepoint 2010 Calendar gives Error

Hi 

When try to connect to Outlook from Sharepoint Calendar to Outlook gives Error Message Task 'SharePoint' reported error (0x80004005) : 'An error occurred in this SharePoint List (WorkCalendar). Try updating the folder again. If the problem continues, contact the SharePoint site administrator.  HTTP 500.  The server returned the following error message: Exception of type 'Microsoft.SharePoint.SoapServer.SoapServerException' was thrown.'

Please suggest

Thanks