Setting a name above player

Scripting Issues
3 
                self.userlistnametext[self.data[0]] = TextNode(str(self.data[0]))
                self.userlistnametext[self.data[0]].setText(self.data[0])
                self.userlistnametextNode[self.data[0]].attachNewNode(str(self.userlistnametext[self.data[0]]))
                self.userlistnametextNode[self.data[0]].setPos=(self.userlist[self.data[0]], 0, 0, 6)
                self.userlistnametextNode[self.data[0]].setBillboardPointEye()

Ok I did what you said but now i’m sorta having another problem. It says keyerror then post the name of that user or aka self.data[0].