Error

Object reference not set to an instance of an object.
   at Volvo.CWP.SharePoint.Applications.Internet.Context.InternetContext.InternetFieldControlHost`1.DetermineControlMode(ICWPContext context, ICwpFieldControl`1 control)
   at Volvo.CWP.SharePoint.FieldControls.CwpFieldControlHostBase`1.Registering(ICwpFieldControl`1 fieldControl)
   at Volvo.CWP.SharePoint.FieldControls.CwpFieldControlHostBase`1.Register(ICwpFieldControl`1 fieldControl)
   at Volvo.CWP.SharePoint.FieldControls.CWPBaseFieldControl`1.OnInit(EventArgs e)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)