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NOVA_Placement service credentials do not work

Hi all I am using Ububtu 18.04 with Stein release I wonder what is the issue of "Details: Placement service credentials do not work." when I issue the "nova-status upgrade check" command here is the output:

here is the nova.conf configuration file:

and here is the nova-scheduler log file: which the issue is as follow: "Got no allocation candidates from the Placement API. This could be due to insufficient resources or a temporary occurrence as compute nodes start up."

any help would be appreciated. thanks