Closed Unassigned: Element 'ScriptManager' is not a known element [27908]

Hi,
I updated the AjaxControlToolKit, but now I have this Issue.

in my web Config I have this:
<pages>
<controls>
<add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" />
</controls>
</pages>

I found this:
<add tagPrefix="ajax" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

Whit that change 'ScriptManager' work fine, but doesn´t work ControlBundles
<ControlBundles>
<AspAjax:ControlBundle Name="FilteredTextBox" />
<AspAjax:ControlBundle Name="ModalPopup" />
<AspAjax:ControlBundle Name="Calendar" />
</ControlBundles>


I Used Nuget, I need to do someting else?