I redid the tutorial and still had no luck.
Server Error in '/KenticoCMS7' Application.
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The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.
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.Web.HttpException: The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[HttpException (0x80004005): The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.]
System.Web.UI.ControlCollection.Add(Control child) +11415588
CMS.UIControls.ContentPage.EnsureScriptManager() +442
CMS.ExtendedControls.CMSUpdatePanel.OnInit(EventArgs e) +110
System.Web.UI.Control.InitRecursive(Control namingContainer) +133
System.Web.UI.Control.InitRecursive(Control namingContainer) +421
System.Web.UI.Control.InitRecursive(Control namingContainer) +421
System.Web.UI.Control.InitRecursive(Control namingContainer) +421
System.Web.UI.Control.InitRecursive(Control namingContainer) +421
System.Web.UI.Control.AddedControl(Control control, Int32 index) +277
CMS.PortalControls.CMSPortalManager.CreateEditMenu(PageInfo pi, Boolean isPreview, ViewModeEnum viewMode) +625
CMS.PortalControls.CMSPortalManager.CreateChildControls() +725
System.Web.UI.Control.EnsureChildControls() +182
System.Web.UI.Control.InitRecursive(Control namingContainer) +133
System.Web.UI.Control.InitRecursive(Control namingContainer) +421
System.Web.UI.Control.InitRecursive(Control namingContainer) +421
System.Web.UI.Control.InitRecursive(Control namingContainer) +421
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1970