Why is restore failing at "TASK [restore : Tower | Dump the new Tower instance topology]"?

Issue

• Why restore returns below error:

  fatal: [example.com]: FAILED! => {"changed": true, "cmd": " pg_dump  --clean --create  --host='example.com'  --port=5432  --username='awx'  --dbname='awx'  --table=main_instance  --table=main_instancegroup  --table=main_instancegroup_instances > new_instance_topology.db\n", "delta": "X:XX:XX.XXXX", "end": "XXXX-XX-XX X:XX:XX.XXXX", "msg": "non-zero return code", "rc": 1, "start": "XXXX-XX-XX X:XX:XX.XXXX", "stderr": "pg_dump: no matching tables were found", "stderr_lines": ["pg_dump: no matching tables were found"], "stdout": "", "stdout_lines": []}