Problem while creating VM in devstack

I have installed Devstack version pike with ceilometer, gnocchi, grafana, Aodh on ubuntu 16.04. The complete installation is over single laptop. However, Once I create VM, It gives following error: Error: Host ' ------- ' is not mapped to any cell. I don,t know what is causing this problem. Can some body please tell me what can be the problem and possible solution. I am new to all this stuff, so please be precise and easy with guidance. Thanks in advance. Link for my local.conf file, used to run 'stack.sh' is as follows: (In case it can be of any help).

paste.openstack.org/show/627565

Please help.