Why am I getting "Database settings are not available, using defaults." error in Ansible Automation Controller?

Issue

• The automation controller causes an error regarding the database connectivity that is recorded in the /var/log/tower/tower.log as below.

  2022-10-25 02:53:43,180 ERROR    [-] awx.conf.settings Database settings are not available, using defaults.
  Traceback (most recent call last):
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/django/db/backends/base/base.py", line 235, in _cursor
      return self._prepare_cursor(self.create_cursor(name))
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/django/db/backends/postgresql/base.py", line 223, in create_cursor
      cursor = self.connection.cursor()
  psycopg2.InterfaceError: connection already closed
  
  The above exception was the direct cause of the following exception:
  
  Traceback (most recent call last):
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/awx/conf/settings.py", line 81, in _ctit_db_wrapper
  yield
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/awx/conf/settings.py", line 405, in __getattr__
  value = self._get_local(name)
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/awx/conf/settings.py", line 349, in _get_local
  setting = Setting.objects.filter(key=name, user__isnull=True).order_by('pk').first()
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/django/db/models/query.py", line 653, in first
  for obj in (self if self.ordered else self.order_by('pk'))[:1]:
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/django/db/models/query.py", line 274, in __iter__
      self._fetch_all()
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/django/db/models/query.py", line 1242, in _fetch_all
      self._result_cache = list(self._iterable_class(self))
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/django/db/models/query.py", line 55, in __iter__
  results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/django/db/models/sql/compiler.py", line 1140, in execute_sql
      cursor = self.connection.cursor()
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/django/db/backends/base/base.py", line 256, in cursor
  return self._cursor()
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/django/db/backends/base/base.py", line 235, in _cursor
  return self._prepare_cursor(self.create_cursor(name))
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/django/db/utils.py", line 89, in __exit__
  raise dj_exc_value.with_traceback(traceback) from exc_value
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/django/db/backends/base/base.py", line 235, in _cursor
      return self._prepare_cursor(self.create_cursor(name))
    File "/var/lib/awx/venv/awx/lib64/python3.8/site-packages/django/db/backends/postgresql/base.py", line 223, in create_cursor
      cursor = self.connection.cursor()
  django.db.utils.InterfaceError: connection already closed