This happened to me as well.
Edit: This is the error message that appears for me.
Server Error in '/' Application.
Specified cast is not valid.
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.InvalidCastException: Specified cast is not valid.
Source Error:
Line 349: HeaderStyle-CssClass="inverse1" HeaderStyle-ForeColor="#FFFFFF">
Line 350: <ItemTemplate>
Line 351: <cys:DifficultyLevelImage runat="server" DifficultyLevel='<%#Eval("Difficulty_Level") %>' />
Line 352: </ItemTemplate>
Line 353: </asp:TemplateField>
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Source File: c:\Websites\ChooseYourStory\ChooseYourStory.com\Stories\Category.aspx Line: 351
Stack Trace:
[InvalidCastException: Specified cast is not valid.]
ChooseYourStory.Web.UI.Stories.Category.__DataBinding__control20(Object sender, EventArgs e) in c:\Websites\ChooseYourStory\ChooseYourStory.com\Stories\Category.aspx:351
System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +304
System.Web.UI.Control.DataBindChildren() +11252903
System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +321
System.Web.UI.Control.DataBindChildren() +11252903
System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +321
System.Web.UI.WebControls.GridView.CreateRow(Int32 rowIndex, Int32 dataSourceIndex, DataControlRowType rowType, DataControlRowState rowState, Boolean dataBind, Object dataItem, DataControlField[] fields, TableRowCollection rows, PagedDataSource pagedDataSource) +287
System.Web.UI.WebControls.GridView.CreateChildControls(IEnumerable dataSource, Boolean dataBinding) +4572
System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data) +94
System.Web.UI.WebControls.GridView.PerformDataBinding(IEnumerable data) +18
System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) +182
System.Web.UI.WebControls.DataBoundControl.PerformSelect() +274
System.Web.UI.Control.DataBindChildren() +11252903
System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +321
System.Web.UI.Control.DataBindChildren() +11252903
System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +321
System.Web.UI.Control.DataBindChildren() +11252903
System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +321
System.Web.UI.Control.DataBindChildren() +11252903
System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +321
ChooseYourStory.Web.UI.Stories.Category.Page_PreRender(Object sender, EventArgs e) in c:\Websites\ChooseYourStory\ChooseYourStory.com\Stories\Category.aspx:174
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25
System.Web.UI.Control.PreRenderRecursiveInternal() +113
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4185
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Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1