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VM instance shutdown by itself after running 5-10 minutes

I'm new to openstack and installed Essex on Ubuntu 12.04.2.LTS. When I launched a instance of a VM from Horizon, it successfully launched it. After running for about 5-10minutes, however, it shuts down by itself and gets stuck in 'Shuoff" state.

I did 'sudo grep -R 'ERROR' /var/log/nova/" and got the bellow error:

/var/log/nova/nova-consoleauth.log:2013-04-15 03:50:08 ERROR nova.rpc.amqp [req-4cc053af-9872-42f5-bf55-a79405280d1e eb8d00839a6c46d49fe0d91829a6664a e3c575da8e934bbfaca008ac2e7f6f68] Exception during message handling /var/log/nova/nova-consoleauth.log:2013-04-15 04:41:54 ERROR nova.rpc.amqp [req-7b71c7a1-2ae9-492b-bcd1-896865fa51c9 eb8d00839a6c46d49fe0d91829a6664a e3c575da8e934bbfaca008ac2e7f6f68] Exception during message handling /var/log/nova/nova-consoleauth.log:2013-04-15 05:31:33 ERROR nova.rpc.amqp [req-b7c230e8-7a75-42bd-811f-d1e922783e2d eb8d00839a6c46d49fe0d91829a6664a e3c575da8e934bbfaca008ac2e7f6f68] Exception during message handling

Can anyone advise me how to debug from here? Thanks in adviance