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from_buffer() cannot return the address of the raw string within a str or unicode or bytearray object (HTTP 400)

During executing

openstack project create --domain default --description "Service Project" service

for config keyston on controller by this tutorial :

https://docs.openstack.org/keystone/pike/install/keystone-users-ubuntu.html

i get this error

from_buffer() cannot return the address of the raw string within a str or unicode or bytearray object (HTTP 400).

please guide me Why this error occurs?