Orchard Html widget import error - orchardcms

Question

After importing html widget content using the cms 'import tab' following error occurs: (Orchard 1.8.0)
(Error occurs only when selecting 'widgets' left menu item in dashboard)
Similar to http://orchard.codeplex.com/workitem/17992 but solution not in orchard 1.8 yet it appears?
Server Error in '/' Application.
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 20: #if (count > 0) {
Line 21: int i = 0;
Line 22: foreach (WidgetPart widget in widgets.Where(w => w.Zone == zone).OrderBy(w => w.Position, new Orchard.UI.FlatPositionComparer())) {
Line 23: <li class="widgets-#(widget.LayerId == Model.CurrentLayer.Id ? "this" : "other")-layer widgets-layer-#widget.LayerId#(i == 0 ? " first" : (i == count ? " last" : ""))">
Line 24: #using (Html.BeginFormAntiForgeryPost()) {
Source File: c:\ ~\Modules\Orchard.Widgets\Views\WidgetPlacement.Zones.cshtml Line: 22
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.]
Orchard.Widgets.Models.WidgetPart.get_LayerId() +35
ASP._Page_Modules_Orchard_Widgets_Views_WidgetPlacement_Zones_cshtml.Execute() in c:\ ~\Modules\Orchard.Widgets\Views\WidgetPlacement.Zones.cshtml:22
System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +199
System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +104
System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +90
System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +256
System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +107
System.Web.Mvc.HtmlHelper.RenderPartialInternal(String partialViewName, ViewDataDictionary viewData, Object model, TextWriter writer, ViewEngineCollection viewEngineCollection) +277
System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData) +91
Orchard.DisplayManagement.Descriptors.ShapeTemplateStrategy.ShapeTemplateBindingStrategy.Render(ShapeDescriptor shapeDescriptor, DisplayContext displayContext, HarvestShapeInfo harvestShapeInfo, HarvestShapeHit harvestShapeHit) in c:\Orchard\src\Orchard\DisplayManagement\Descriptors\ShapeTemplateStrategy\ShapeTemplateBindingStrategy.cs:146
Orchard.DisplayManagement.Descriptors.ShapeTemplateStrategy.<>c__DisplayClass28.<Discover>b__15(DisplayContext displayContext) in c:\Orchard\src\Orchard\DisplayManagement\Descriptors\ShapeTemplateStrategy\ShapeTemplateBindingStrategy.cs:133
Orchard.DisplayManagement.Descriptors.<>c__DisplayClass5.<BoundAs>b__2(DisplayContext displayContext) in c:\Orchard\src\Orchard\DisplayManagement\Descriptors\ShapeAlterationBuilder.cs:56
Orchard.DisplayManagement.Implementation.DefaultDisplayManager.Process(ShapeBinding shapeBinding, IShape shape, DisplayContext context) in c:\Orchard\src\Orchard\DisplayManagement\Implementation\DefaultDisplayManager.cs:183
Orchard.DisplayManagement.Implementation.DefaultDisplayManager.Execute(DisplayContext context) in c:\Orchard\src\Orchard\DisplayManagement\Implementation\DefaultDisplayManager.cs:87
Orchard.DisplayManagement.Implementation.DisplayHelper.ShapeExecute(Object shape) in c:\Orchard\src\Orchard\DisplayManagement\Implementation\DisplayHelper.cs:86
Orchard.DisplayManagement.Implementation.DisplayHelper.Invoke(String name, INamedEnumerable`1 parameters) in c:\Orchard\src\Orchard\DisplayManagement\Implementation\DisplayHelper.cs:40
Orchard.DisplayManagement.Implementation.DisplayHelper.TryInvokeMember(InvokeMemberBinder binder, Object[] args, Object& result) in c:\Orchard\src\Orchard\DisplayManagement\Implementation\DisplayHelper.cs:34
CallSite.Target(Closure , CallSite , Object , Object , Object , Object ) +391
ASP._Page_Modules_Orchard_Widgets_Views_WidgetPlacement_cshtml.Execute() in c:\ ~\Modules\Orchard.Widgets\Views\WidgetPlacement.cshtml:20
System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +199
System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +104
System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +90
System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +256
System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +107
System.Web.Mvc.HtmlHelper.RenderPartialInternal(String partialViewName, ViewDataDictionary viewData, Object model, TextWriter writer, ViewEngineCollection viewEngineCollection) +277
System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData) +91
Orchard.DisplayManagement.Descriptors.ShapeTemplateStrategy.ShapeTemplateBindingStrategy.Render(ShapeDescriptor shapeDescriptor, DisplayContext displayContext, HarvestShapeInfo harvestShapeInfo, HarvestShapeHit harvestShapeHit) in c:\Orchard\src\Orchard\DisplayManagement\Descriptors\ShapeTemplateStrategy\ShapeTemplateBindingStrategy.cs:146
Orchard.DisplayManagement.Descriptors.ShapeTemplateStrategy.<>c__DisplayClass28.<Discover>b__15(DisplayContext displayContext) in c:\Orchard\src\Orchard\DisplayManagement\Descriptors\ShapeTemplateStrategy\ShapeTemplateBindingStrategy.cs:133
Orchard.DisplayManagement.Descriptors.<>c__DisplayClass5.<BoundAs>b__2(DisplayContext displayContext) in c:\Orchard\src\Orchard\DisplayManagement\Descriptors\ShapeAlterationBuilder.cs:56
Orchard.DisplayManagement.Implementation.DefaultDisplayManager.Process(ShapeBinding shapeBinding, IShape shape, DisplayContext context) in c:\Orchard\src\Orchard\DisplayManagement\Implementation\DefaultDisplayManager.cs:183
Orchard.DisplayManagement.Implementation.DefaultDisplayManager.Execute(DisplayContext context) in c:\Orchard\src\Orchard\DisplayManagement\Implementation\DefaultDisplayManager.cs:87
Orchard.DisplayManagement.Implementation.DisplayHelper.ShapeExecute(Object shape) in c:\Orchard\src\Orchard\DisplayManagement\Implementation\DisplayHelper.cs:86
Orchard.DisplayManagement.Implementation.DisplayHelper.Invoke(String name, INamedEnumerable`1 parameters) in c:\Orchard\src\Orchard\DisplayManagement\Implementation\DisplayHelper.cs:40
Orchard.DisplayManagement.Implementation.DisplayHelper.TryInvokeMember(InvokeMemberBinder binder, Object[] args, Object& result) in c:\Orchard\src\Orchard\DisplayManagement\Implementation\DisplayHelper.cs:34
CallSite.Target(Closure , CallSite , Object , Object , Object , Object , Object ) +439
ASP._Page_Modules_Orchard_Widgets_Views_admin_Index_cshtml.Execute() in c:\ ~\Modules\Orchard.Widgets\Views\Admin\Index.cshtml:9
System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +199
System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +104
System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +90
System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +256
System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +107
Orchard.Mvc.ViewEngines.ThemeAwareness.<>c__DisplayClass7.<FindView>b__5(ViewContext viewContext, TextWriter writer, IViewDataContainer viewDataContainer) in c:\Orchard\src\Orchard\Mvc\ViewEngines\ThemeAwareness\LayoutAwareViewEngine.cs:59
Orchard.Mvc.ViewEngines.ThemeAwareness.LayoutView.Render(ViewContext viewContext, TextWriter writer) in c:\Orchard\src\Orchard\Mvc\ViewEngines\ThemeAwareness\LayoutAwareViewEngine.cs:90
System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +291
System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +13
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +56
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +52
System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +173
System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +100
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27
System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +13
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +36
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +54
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +39
System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +12
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +28
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +54
System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +29
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10
System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +21
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +36
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +54
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +31
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
Orchard.Mvc.Routes.HttpAsyncHandler.EndProcessRequest(IAsyncResult result) in c:\Orchard\src\Orchard\Mvc\Routes\ShellRoute.cs:159
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9514928
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
Widget XML content:
<!--Exported from Orchard-->
<Orchard>
<Recipe>
<Name>Generated by Orchard.ImportExport</Name>
<Author>admin</Author>
<ExportUtc>2014-08-15T00:51:30.8909012Z</ExportUtc>
</Recipe>
<Metadata>
<Types>
<HtmlWidget Stereotype="Widget" DisplayName="Html Widget">
<WidgetPart />
<BodyPart />
<CommonPart />
<IdentityPart />
</HtmlWidget>
</Types>
<Parts>
<WidgetPart ContentPartSettings.Attachable="True" ContentPartSettings.Description="Turns a content type into a Widget. Note: you need to set the stereotype to "Widget" as well." />
<BodyPart ContentPartSettings.Attachable="True" ContentPartSettings.Description="Allows the editing of text using an editor provided by the configured flavor (e.g. html, text, markdown)." BodyPartSettings.FlavorDefault="html" />
<CommonPart ContentPartSettings.Attachable="True" ContentPartSettings.Description="Provides common information about a content item, such as Owner, Date Created, Date Published and Date Modified." />
<IdentityPart ContentPartSettings.Attachable="True" ContentPartSettings.Description="Automatically generates a unique identity for the content item, which is required in import/export scenarios where one content item references another." />
</Parts>
</Metadata>
...cont..