I am trying to install OpenStack (Pike) on Ubuntu 16.04 LTS. I have already installed basic modules of OpenStack like compute, image, glance, keystone, cinder, Horizon by following guidelines available on link: https://docs.openstack.org/devstack/latest/. I have followed it completely, except installing Pike instead of Queen.

Now I am trying to install Ceilometer by following link: https://docs.openstack.org/ceilometer/pike/install/install-base-ubuntu.html, but Once I try to install Gnocchi, it gives error. which is as follows. Please guide in simple and definite steps, as I am quite novice in Linux and OpenStack.