Exception in VS2012

System.Resources.MissingManifestResourceException was unhandled by user code
  HResult=-2146233038
  Message=Could not find any resources appropriate for the specified culture or the neutral culture.  Make sure "AjaxControlToolkit.Properties.Resources.NET4.resources" was correctly embedded or linked into assembly "AjaxControlToolkit" at compile time, or that all the satellite assemblies required are loadable and fully signed.
  Source=mscorlib
  StackTrace:
       at System.Resources.ManifestBasedResourceGroveler.HandleResourceStreamMissing(String fileName)
       at System.Resources.ManifestBasedResourceGroveler.GrovelForResourceSet(CultureInfo culture, Dictionary`2 localResourceSets, Boolean tryParents, Boolean createIfNotExists, StackCrawlMark& stackMark)
       at System.Resources.ResourceManager.InternalGetResourceSet(CultureInfo requestedCulture, Boolean createIfNotExists, Boolean tryParents, StackCrawlMark& stackMark)
       at System.Resources.ResourceManager.InternalGetResourceSet(CultureInfo culture, Boolean createIfNotExists, Boolean tryParents)
       at System.Resources.ResourceManager.GetString(String name, CultureInfo culture)
       at AjaxControlToolkit.Properties.Resources_NET4.get_E_NoScriptManager() in c:\TeamCity\buildAgent\work\86982cda3515e83b\Server\AjaxControlToolkit\Properties\Resources.NET4.Designer.cs:line 68
       at AjaxControlToolkit.ScriptObjectBuilder.RegisterCssReferences(Control control) in c:\TeamCity\buildAgent\work\86982cda3515e83b\Server\AjaxControlToolkit\ExtenderBase\ScriptObjectBuilder.cs:line 332
       at AjaxControlToolkit.ScriptControlBase.OnLoad(EventArgs e) in c:\TeamCity\buildAgent\work\86982cda3515e83b\Server\AjaxControlToolkit\ExtenderBase\ScriptControlBase.cs:line 262
       at System.Web.UI.Control.LoadRecursive()
       at System.Web.UI.Control.LoadRecursive()
       at System.Web.UI.Control.LoadRecursive()
       at System.Web.UI.Control.LoadRecursive()
       at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
  InnerException: