[web2py] something wrong with crud.delete

[Web2Py Freak]

Hello guys ,

am trying to use crud.delete and it keeps giving this  (404 NOT
FOUND)

this is the controller :

def removepost():
 form = crud.delete(db.blogpost,request.args(0)
                       ,message='your Post Was Deleted',
            next=URL('media'))
 return dict(form=form)


this is the view :

{{extend 'layout.html'}}
<h1>Delete This blogpost</h1>
{{=form}}


So anyone can tell me whats wrong ??