Method not found: 'Csla.Data.SafeDataReader

Line 84:             };
Line 85:             RaiseListChangedEvents = true;
Line 86:         }
Line 87: 
Line 88:         protected override void DataPortal_Update()

[MissingMethodException: Method not found: 'Csla.Data.SafeDataReader XECOMIT.ERPByNet.DataAccessEntities.ProjectScheduleRevisionDA.Get(Int32)'.]
   XECOMIT.ERPByNet.BusinessEntities.ProjectScheduleRevisions.DataPortal_Fetch(Criteria criteria) in E:\ERPByNet\trunk\SVN_ERPByNet\BusinessEntities\Projects\ProjectScheduleRevisions.cs:86

[CallMethodException: DataPortal_Fetch method call failed]
   Csla.MethodCaller.CallMethod(Object obj, MethodInfo info, Object[] parameters) in D:\IQQMS\Csla\DataPortal\MethodCaller.cs:56
   Csla.MethodCaller.CallMethod(Object obj, String method, Object[] parameters) in D:\IQQMS\Csla\DataPortal\MethodCaller.cs:37
   Csla.Server.SimpleDataPortal.Fetch(Object criteria, DataPortalContext context) in D:\IQQMS\Csla\DataPortal\Server\SimpleDataPortal.cs:101

[DataPortalException: DataPortal.Fetch failed]
   Csla.DataPortal.Fetch(Object criteria) in D:\IQQMS\Csla\DataPortal\Client\DataPortal.cs:173
   Csla.DataPortal.Fetch(Object criteria) in D:\IQQMS\Csla\DataPortal\Client\DataPortal.cs:138
   XECOMIT.ERPByNet.BusinessEntities.ProjectScheduleRevisions.GetProjectScheduleRevision(Int32 opportunityID) in E:\ERPByNet\trunk\SVN_ERPByNet\BusinessEntities\Projects\ProjectScheduleRevisions.cs:40
   ManageScheduleRevisions.CreateScheduleRevisionVersionNodes(RadTreeNode OpportunityGroupItemNode) in e:\ERPByNet\trunk\SVN_ERPByNet\Applications\SalesPundit\ManageScheduleRevisions.aspx.cs:602
   ManageScheduleRevisions.CreateNodesForGroupItem(RadTreeNode OpportunityNode) in e:\ERPByNet\trunk\SVN_ERPByNet\Applications\SalesPundit\ManageScheduleRevisions.aspx.cs:589
   ManageScheduleRevisions.PopulateTreeView(RadTreeView treeView) in e:\ERPByNet\trunk\SVN_ERPByNet\Applications\SalesPundit\ManageScheduleRevisions.aspx.cs:570
   ManageScheduleRevisions.BindTreeView() in e:\ERPByNet\trunk\SVN_ERPByNet\Applications\SalesPundit\ManageScheduleRevisions.aspx.cs:556
   ManageScheduleRevisions.Page_Load(Object sender, EventArgs e) in e:\ERPByNet\trunk\SVN_ERPByNet\Applications\SalesPundit\ManageScheduleRevisions.aspx.cs:77
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +50
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627