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This is a common error when the nova-scheduler can't find any suitable compute node to launch instance.

1) Check the output of 'nova-manage service list'. If 'nova-compute' and 'libvirt-bin' services are working fine, then it should show enabled and status should be :-)

2) If any compute node is available and enabled, check /var/log/nova/nova-compute.log in that node and see if you could find any errors. (see the old logs , as you cant see any logs while launching instance as the the request would be stopped at the scheduler itself)

3) If everything is fine and clean, then the compute node should be lack of resources. In this case, you can create a small flavor and try to launch instance with that flavor.