[NullReferenceException: Object reference not set to an instance of an object.]
Microsoft.SharePoint.WebPartPages.SPWebPartManager.RegisterRibbonTabs() +864
Microsoft.SharePoint.WebPartPages.SPWebPartManager.OnPreRender(EventArgs e) +983
System.Web.UI.Control.PreRenderRecursiveInternal() +178
System.Web.UI.Control.PreRenderRecursiveInternal() +275
System.Web.UI.Control.PreRenderRecursiveInternal() +275
System.Web.UI.Control.PreRenderRecursiveInternal() +275
System.Web.UI.Control.PreRenderRecursiveInternal() +275
System.Web.UI.Control.PreRenderRecursiveInternal() +275
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6880
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