Openstack installation error with nova and authentification - linux

This is the first time i'm using openstack, I'm really a new one, I'm doing right now an OpenStack packstack installation, I've generated an answer file in which i specify the following parameters : (notice that I've followed a website doing that i don't know exactly what does all of these parameters means)
CONFIG_PROVISION_DEMO=n
CONFIG_NEUTRON_ML2_TYPE_DRIVERS=flat,vxlan
CONFIG_NEUTRON_ML2_TENANT_NETWORK_TYPES=vxlan
CONFIG_NEUTRON_ML2_MECHANISM_DRIVERS=openvswitch
CONFIG_NEUTRON_L2_AGENT=openvswitch
CONFIG_NEUTRON_OVS_EXTERNAL_PHYSNET=extnet
CONFIG_NEUTRON_OVS_BRIDGE_MAPPINGS=extnet:br-ex
CONFIG_NEUTRON_OVS_BRIDGE_IFACES=br-ex:em1
I'm getting the following error :
ERROR : Error appeared during Puppet run: 10.53.193.172_controller.pp Notice: /Stage[main]/Nova::Db::Sync/Exec[nova-db-sync]/returns: Error: (pymysql.err.OperationalError) (1045, u"Access denied for user 'nova'#'10.53.193.172' (using password: YES)") (Background on this error at: sqlalche.me/e/e3q8) You will find full trace in log /var/tmp/packstack/20210401-074033-eKhyZ8/manifests/10.53.193.172_controller.pp.log
I've search how to solve it,and i didn't find anything helpful, so i ignored it and I've try to re-run the packstack --answer-file=answerfile.txt, and I'm getting this time a new error :
ERROR : Error appeared during Puppet run: 10.53.193.172_controller.pp
Error: Failed to apply catalog: Could not authenticate
You will find full trace in log /var/tmp/packstack/20210401-082518-KWFGCT/manifests/10.53.193.172_controller.pp.log
Please check log file /var/tmp/packstack/20210401-082518-KWFGCT/openstack-setup.log for more information
Any help, please !

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