Server Error in '/' Application.

Collection was modified; enumeration operation may not execute.

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.InvalidOperationException: Collection was modified; enumeration operation may not execute.

Source Error:


Line 256:                                <div class="category-navigation" id="divCategoryMenu" runat="server">
Line 257:                                    <div class="title">
Line 258:                                        <a href="<%=Page.ResolveUrl(PageMap.Category.Base) %>">Categories</a>
Line 259:                                    </div>
Line 260:                                    <div class="clear">

Source File: c:\websites\RevoHobbies\MasterPage.Master    Line: 258

Stack Trace:


[InvalidOperationException: Collection was modified; enumeration operation may not execute.]
   System.Collections.ArrayListEnumeratorSimple.MoveNext() +14493847
   Telerik.Web.UI.RadPanelBar.RenderItems(HtmlTextWriter writer) +194
   Telerik.Web.UI.RadPanelBar.RenderContents(HtmlTextWriter writer) +207
   System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer) +50
   Telerik.Web.UI.RadDataBoundControl.Render(HtmlTextWriter writer) +94
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +80
   ASP.masterpage_master.__RenderdivCategoryMenu(HtmlTextWriter __w, Control parameterContainer) in c:\websites\RevoHobbies\MasterPage.Master:258
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +276
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +47
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +80
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +169
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +47
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +80
   ASP.masterpage_master.__RenderaspnetForm(HtmlTextWriter __w, Control parameterContainer) in c:\websites\RevoHobbies\MasterPage.Master:174
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +276
   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +11662591
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +47
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +80
   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +53
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +169
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +80
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +169
   System.Web.UI.Page.Render(HtmlTextWriter writer) +40
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +80
   Telerik.Web.UI.RadAjaxControl.RenderPageInAjaxMode(HtmlTextWriter writer, Control page) +980
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +276
   System.Web.UI.Page.Render(HtmlTextWriter writer) +40
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +80
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4239


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4700.0