I have just installed fresh dnn 7 source for development. But when i click Host/Site/Page Settings it get exception:
A critical error has occurred. Object reference not set to an instance of an object.

My vs2012 exception trace:
at DotNetNuke.ExtensionPoints.EditPagePanelExtensionControl.LoadControl(IEditPagePanelExtensionPoint extension) in d:\My Works\My Projects\MicroCard\dev\DNN Platform\Library\ExtensionPoints\EditPagePanelExtensionControl.cs:line 36
at DotNetNuke.ExtensionPoints.EditPagePanelExtensionControl.OnInit(EventArgs e) in d:\My Works\My Projects\MicroCard\dev\DNN Platform\Library\ExtensionPoints\EditPagePanelExtensionControl.cs:line 52
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Control.AddedControl(Control control, Int32 index)
at System.Web.UI.ControlCollection.Add(Control child)
at DotNetNuke.UI.Modules.ModuleHost.LoadAjaxPanel() in d:\My Works\My Projects\MicroCard\dev\DNN Platform\Library\UI\Modules\ModuleHost.cs:line 343
at DotNetNuke.UI.Modules.ModuleHost.CreateChildControls() in d:\My Works\My Projects\MicroCard\dev\DNN Platform\Library\UI\Modules\ModuleHost.cs:line 499
at System.Web.UI.Control.EnsureChildControls()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)