I was trying to implement site search to my existing Umbraco website, following the video tutorial on Examine.

Now, everytime I open a document type under Settings, it gives me this error.

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentException: Input parameter 'controlId' cannot be an empty string.
   at System.Web.Util.StringUtil.CheckAndTrimString(String paramValue, String paramName, Boolean throwIfNull, Int32 lengthToCheck)
   at System.Web.UI.ClientScriptManager.RegisterExpandoAttribute(String controlId, String attributeName, String attributeValue, Boolean encode)
   at System.Web.UI.ScriptRegistrationManager.RegisterExpandoAttribute(Control control, String controlId, String attributeName, String attributeValue, Boolean encode)
   at System.Web.UI.ScriptManager.RegisterExpandoAttribute(Control control, String controlId, String attributeName, String attributeValue, Boolean encode)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
   at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)
   at System.Web.UI.WebControls.ValidatorCompatibilityHelper.RegisterExpandoAttribute(Control control, String controlId, String attributeName, String attributeValue, Boolean encode)
   at System.Web.UI.WebControls.BaseValidator.AddAttributesToRender(HtmlTextWriter writer)
   at System.Web.UI.WebControls.RequiredFieldValidator.AddAttributesToRender(HtmlTextWriter writer)
   at System.Web.UI.WebControls.WebControl.RenderBeginTag(HtmlTextWriter writer)
   at System.Web.UI.WebControls.BaseValidator.Render(HtmlTextWriter writer)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
   at umbraco.uicontrols.PropertyPanel.Render(HtmlTextWriter writer)

I tried restoring ExamineIndex.config and ExamineSettings.config as far as I could remember, but the error persists.

Any idea how to fix this? Thanks in advance.