soap:ServerServer was unable to process request. ---> Value does not fall within the expected range.

If you renamed your SharePoint site or added a new Alternate access mapping (access via central admin), then use the new mapped name using SharePoint Designer 2010 (as opposed to the servename you might be using now). And you would notice that this error "soap:ServerServer was unable to process request. ---> Value does not fall within the expected range." goes away...