Cannot Write Queues Configuration

Hi all,

   I am new to freepbx. I am using version 2.4.0. During my process with setup adminstration, I got Freepbx error Notification :

FreePBX Notices

Cannot Write Queues Configuration
Failed creating/overwriting Queues extensions file: /etc/asterisk/queues_additional.conf
Added 9 hours, 22 minutes ago
(retrieve_conf.FATAL)

Can anyone help me out from this problem.

Regards,
John