The browser or gateway element with ID 'safari1plus' cannot be found

Hi,

I have upgraded my application ASP.net 2.0 to ASP.net4.0

Application is sucessfully upgraded but I am getting below error when building the website:


Error      3      The browser or gateway element with ID 'safari1plus' cannot be found. (App_Browsers\Safari.browser line 2)            


File name: Safari.browser


<browsers>
  <browser refID="safari1plus">
    <capabilities>
    <capability name="supportsMaintainScrollPositionOnPostback"
        value="true" />
    </capabilities>
    <controlAdapters>
      <adapter controlType="System.Web.UI.WebControls.Menu" adapterType=""/>
    </controlAdapters>
  </browser>
</browsers>


Please suggest the solution

Regards