asp.net mvc - ViewResult class result not work when i submit a form method post for redirect to another view -

when sumit form want redirect page viewresult class. filter code :

 [validatespamfilter(duration: 60, isaddress: false, keeprequestincache: true)]     // httppost method submit form . can add comment method .     [system.web.mvc.httppost]     public actionresult addcomment(commentadddto comments) 

and

 filtercontext.result = new viewresult { viewname = "~/error/index"  }; 

this work actionresutland partialviewresult get methods. want uses actionresutland post method . because submit form method , below error

'~/error/index' or master not found or no view engine supports searched locations. following locations searched:\r\n~/error/index"