FILENAME /usr/bin/mysql does not exists. Make sure correct path is set in /etc/dump admin/settings.conf.
$cfg['DefaultFunctions'] = [
'FUNC_CHAR' => '',
'FUNC_DATE' => '',
'FUNC_NUMBER' => '',
'FUNC_SPATIAL' => 'ST_GeomFromText',
'FUNC_UUID' => 'UUID',
'first_timestamp' => 'UTC_TIMESTAMP',
];