I get Server Error in '/' Application. Object reference not set to an instance of an object When trying to Access my SharePoint 2010 Sites all Sites are down.

[NullReferenceException: Object reference not set to an instance of an object.]
   Microsoft.Office.Server.Administration.UserProfileApplicationProxy.get_ApplicationProperties() +134
   Microsoft.Office.Server.Administration.UserProfileApplicationProxy.get_PartitionIDs() +44
   Microsoft.Office.Server.Administration.UserProfileApplicationProxy.IsAvailable(SPServiceContext serviceContext) +329
   Microsoft.Office.Server.WebControls.MyLinksRibbon.get_PortalAvailable() +44
   Microsoft.Office.Server.WebControls.MyLinksRibbon.EnsureMySiteUrls() +60
   Microsoft.Office.Server.WebControls.MyLinksRibbon.get_PortalMySiteUrlAvailable() +15
   Microsoft.Office.Server.WebControls.MyLinksRibbon.OnLoad(EventArgs e) +91
   System.Web.UI.Control.LoadRecursive() +65
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2427