Authentication failure for 'admin' from unix_socket

Hi,I’m not good at English.
If you are kind to tell me, please explain in simple words.

I changed the Openvas database from SQLite to PostgreSQL.
I used for Migration “openvas-migrate-to-postgres”.
I edit “/etc/sysconfig/openvadmd”
OPTION= “–database=tasks”
and I did “systemctl restart openvas-manager”

Then,Icouldn’t Login openvas.

Introduce part of the log.↓
1./var/log/openvas/openvasmd.log
Authentication failure for ‘admin’ from unix_socket

2./var/log/openvas/gsad.log
gsad main:WARNING:2019-06-19 08h55.25 UTC:1891: Authentication failure for ‘admin’ from 192.168.136.1
gsad main:WARNING:2019-06-19 08h57.44 UTC:1891: MHD: Failed to receive data: The TLS connection was non-properly terminated.

Please,Help Me.

<Reference>
OS RHEL7.3

postgresql.x86_64 9.2.24-1.el7_5 @rhel-7-server-rpms
postgresql-libs.x86_64 9.2.24-1.el7_5 @rhel-7-server-rpms
postgresql-server.x86_64 9.2.24-1.el7_5 @rhel-7-server-rpms

GVM/OpenVAS Libraries 9.0.3
OpenVAS Scanner 5.1.3
Greenbone Vulnerability/OpenVAS Manager
Greenbone Security Assistant 7.0.3

openvasmd --create-user=admin
openvasmd --user=admin --new-password=password
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