[HttpException (0x80004005): The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>).]
System.Web.UI.ControlCollection.Add(Control child) +11659892
Telerik.Web.SkinRegistrar.RegisterCssReference(Page _page, Control _control, String _url) +710
[HttpException (0x80004005): Please, see whether wrapping the code block, generating the exception, within RadCodeBlock resolves the error.]
Telerik.Web.SkinRegistrar.RegisterCssReference(Page _page, Control _control, String _url) +815
Telerik.Web.SkinRegistrar.RegisterCssReferences(ISkinnableControl _control) +1241
Telerik.Web.UI.RadTreeView.OnPreRender(EventArgs e) +84
System.Web.UI.Control.PreRenderRecursiveInternal() +132
System.Web.UI.Control.PreRenderRecursiveInternal() +227
System.Web.UI.Control.PreRenderRecursiveInternal() +227
System.Web.UI.Control.PreRenderRecursiveInternal() +227
System.Web.UI.Control.PreRenderRecursiveInternal() +227
System.Web.UI.Control.PreRenderRecursiveInternal() +227
System.Web.UI.Control.PreRenderRecursiveInternal() +227
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3671
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