Hi Gautham,I am getting this error even if I am trying to add a list. When clicked on 'next' on Advanced webpart gallary I am getting Obj ref not set error. One thing I noted is, it is happing only on the default.aspx page of portal landing. I could able to add lists / webparts and click on 'next' ofAdvanced webpart gallary on other pages. Here is the stack trace when click on 'next' of Advanced webpart gallary. I am not getting whether this error is due to some existing webpart on the default.aspx or some other thing.NullReferenceException: Object reference not set to an instance of an object.] Microsoft.SharePoint.WebPartPages.SearchResultTable.NextPage() +120 Microsoft.SharePoint.WebPartPages.SearchToolPart.OnSearchPreRender(Object s, EventArgs e) +636 System.Web.UI.Control.OnPreRender(EventArgs e) +127 System.Web.UI.WebControls.WebParts.EditorPart.OnPreRender(EventArgs e) +18 System.Web.UI.Control.PreRenderRecursiveInternal() +144 System.Web.UI.Control.PreRenderRecursiveInternal() +258 System.Web.UI.Control.PreRenderRecursiveInternal() +258 System.Web.UI.Control.PreRenderRecursiveInternal() +258 System.Web.UI.Control.PreRenderRecursiveInternal() +258 System.Web.UI.Control.PreRenderRecursiveInternal() +258 System.Web.UI.Control.PreRenderRecursiveInternal() +258 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3681Thanks- Pradeep Nulu