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Failed to import plugin clustering && Internal Server Error (HTTP 500)

After installing Heat and Magnum in queens version of Openstack, started seeing below errors in every openstack cli command:

$ openstack hypervisor list
WARNING: Failed to import plugin clustering.

and in specific openstack commands like:

$ openstack coe service list
WARNING: Failed to import plugin clustering.
Internal Server Error (HTTP 500)
$ magnum service-list
ERROR: Internal Server Error (HTTP 500)

What could be the issue and how to resolve this?