human
Solve the following python programming problem given the following code:
def _getRoleList(self, roomJID, role) : 
    '
        Send a request for a role list in a room.
        ' 
    def cb(response) : 
        stanza = AdminStanza.fromElement (response) 
        return stanza.items 
request = AdminStanza (recipient = roomJID, stanzaType = 'get') 
    request.items = [AdminItem (role = role)] 
    d = self.request (self) 
    d.addCallback (cb) 
    return d 

    
    

    Fix the buggy line: d = self.request (self)
assistant
#Here is Python program to fix the buggy line: d = self.

d = self.request (request)