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nova-compute is missing in nova-manage service list

I have installed ubuntu 12.04 lts alomgside windows with 50gb space, 4 gb ram , I5 intel. following devstack.org i have installed openstack for all in one single machine. when i try to launch any image, the error comes like this : Error: Failed to launch instance "cirros2nd": Please try again later [Error: No valid host was found. There are not enough hosts available.].

however the same configuration use to run very smoothly without any errors. now when i have googled for the error, it says,it is because you have less resources which i have enough and 2nd reason is nova-compute is missing from nova-manage service list.

no availability zones are found to launch my image. i have attached ![image descriptionimage description(http://)(http://)(http://)screenshots for the reference.

kindly help. regarding the same. it is my final year project.