human
Solve the following python programming problem given the following code:
def change_owner(self, volume, new_volume) : 
    old_filesystem = self.get (volume) 
    new_filesystem = self.get (new_volume) 
    d = zfs_command (new_volume._reactor, [b'rename', old_filesystem.name, new_filesystem.name]) 
    self._created (d, new_volume) 
    def remounted(ignored) : 
        os.rmdir (old_filesystem.get_path ().path) 
d.addCallback (remounted) 
    d.addCallback ((lambda _ : new_filesystem)) 
    return d 

    
    

    Fix the buggy line: d = zfs_command (new_volume._reactor, [b'rename', old_filesystem.name, new_filesystem.name])
assistant
#Here is Python program to fix the buggy line: d = zfs_command (new_volume.

d = zfs_command (self._reactor, [b'rename', old_filesystem.name, new_filesystem.name])