I am running on DNN 7.2.1 and we got the demo of the store installed and we added some products, but suddenly it started giving us this error:

AssemblyVersion:7.2.1

PortalID:0

PortalName:Natkaya

UserID:1

UserName:hostadmin

ActiveTabID:112

ActiveTabName:Store

RawURL:/Store

AbsoluteURL:/Default.aspx

AbsoluteURLReferrer:http://natkaya.com/BizSignup

UserAgent:Mozilla/5.0 (Windows NT 6.1; WOW64; rv:29.0) Gecko/20100101 Firefox/29.0

DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID:14a1760e-16f8-4ef9-8f6f-58ca76c095cf

InnerException:There is no row at position 0.

FileName:

FileLineNumber:0

FileColumnNumber:0

Method:System.Data.RBTree`1.GetNodeByIndex

StackTrace:

Message:

DotNetNuke.Services.Exceptions.PageLoadException: There is no row at position 0. ---> System.IndexOutOfRangeException: There is no row at position 0. at System.Data.RBTree`1.GetNodeByIndex(Int32 userIndex) at Smith.DNN.Modules.FeaturedProducts.FeaturedProducts.a() at Smith.DNN.Modules.FeaturedProducts.FeaturedProducts.Page_Load(Object sender, EventArgs e) 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.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---