Using ZCS 5.0.5 Open Source Edition on Feodra 7,i386 Platform.

Now,By accessing zimbra admin console,I am getting below error while clicking "Mail Queues" in "Tool" menu.

Server error encountered Message: system failure: exception during auth {RemoteManager:>} Error code: service.FAILURE Method: GetMailQueueInfoRequest Details:soap:Receiver

Please let me know what this error belongs to & how to sort out this error.