Getting a System.NullReferenceException error after updating to v 1.7

Hi, I have updated to v 1.7 and now when I click on some of the products I get this error:

System.NullReferenceException: Object reference not set to an instance of an object.

<%#Server.HtmlEncode(Eval("LocalizedName").ToString())%>

How do I resolve this?

Thank you.

Please go to Admin Area > System > Log and copy a complete error message here

Here it is:

Log type:      Unknown
t Severity:   11
t Message:   Exception of type 'System.Web.HttpUnhandledException' was thrown.
t Exception:   System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.NullReferenceException: Object reference not set to an instance of an object. at ASP.modules_productvariantsingrid_ascx.__DataBind__control4(Object sender, EventArgs e) in c:\HostingSpaces\jewro\justkosherfood.keytoweb.net\wwwroot\Modules\ProductVariantsInGrid.ascx:line 20 at System.Web.UI.Control.OnDataBinding(EventArgs e) at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) at System.Web.UI.Control.DataBind() at System.Web.UI.Control.DataBindChildren() at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) at System.Web.UI.Control.DataBind() at System.Web.UI.WebControls.Repeater.CreateItem(Int32 itemIndex, ListItemType itemType, Boolean dataBind, Object dataItem) at System.Web.UI.WebControls.Repeater.CreateControlHierarchy(Boolean useDataSource) at System.Web.UI.WebControls.Repeater.OnDataBinding(EventArgs e) at System.Web.UI.WebControls.Repeater.DataBind() at NopSolutions.NopCommerce.Web.Modules.ProductVariantsInGridControl.BindData() in F:\etc\nopCommerce_1.70_Source\NopCommerceStore\Modules\ProductVariantsInGrid.ascx.cs:line 58 at NopSolutions.NopCommerce.Web.Modules.ProductVariantsInGridControl.Page_Load(Object sender, EventArgs e) in F:\etc\nopCommerce_1.70_Source\NopCommerceStore\Modules\ProductVariantsInGrid.ascx.cs:line 46 at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) at System.Web.UI.Page.ProcessRequest(HttpContext context) at ASP.product_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\f4379171\de8283e4\App_Web_am5ykfrc.37.cs:line 0 at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

It'll require some debugging
1. Open NopSolutions.NopCommerce.BusinessLogic.Products.ProductVariant class
2. Set breakpoint into get accessor of LocalizedName property
3. See why NullReferenceException is thrown

But I don't have the business logic folder on the server. I have the nopcommerceStore folder with all the subfolders and it's files. Please advice.

And if I have to work on it from my local computer and then recompile everything...
I set the breakpoint at the place mentioned and when I run it I get the error:
Error  1  
Could not load type 'System.Data.Entity.Design.AspNet.EntityDesignerBuildProvider'.  
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\web.config  129  

That's the line in web.config:
<add extension=".edmx" type="System.Data.Entity.Design.AspNet.EntityDesignerBuildProvider" />

How to resolve it?

Thank you.

Alpinhasov wrote:
You need full source code version in order to debug it

Alpinhasov wrote:
http://forums.asp.net/t/1546705.aspx
http://forums.silverlight.net/forums/p/176086/397038.aspx

I figured that out...the web.config error is from my local machine. Any advice on why the error happens?

Alpinhasov wrote:
No idea. Try the links I provided above