Nextcloud 16 failed to add primary storage as digital ocean spaces

Hi,

I got a problem. I can not set digital ocean spaces as nextcloud 16 primary storage. I don’t want to use it as external storage. When I follow nextcloud instructions, I have modified config.php file, and then after change it I can see this error on my all nextcloud 16 web pages

Internal Server Error

The server encountered an internal error and was unable to complete your request.
Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report.
More details can be found in the web server log.

Then I have checked the error log on nextcloud 16 error login showing this error.

[03-Jul-2019 11:55:52 UTC] PHP Parse error:  syntax error, unexpected ',' in /home/xxxxxx/public_html/dash/config/config.php on line 27

This is config.php file sample contents.

<?php
$CONFIG = array (
  'instanceid' => 
  'passwordsalt' => 
  'secret' => 
  'trusted_domains' => 
  array (
    0 => 'xxxxxxxxxxxx',
    1 => 'fra1.digitaloceanspaces.com',
    2 => 'xxxxx.fra1.digitaloceanspaces.com',
    3 => 'digitaloceanspaces.com',
  ),
  
  
  'datadirectory' => '/home/xxxxxx/nextdata',
  'dbtype' => 'mysql',
  'version' => '16.0.1.1',
  'overwrite.cli.url' => 'https://xxxxxxxx',
  'dbname' => 'xxxxxx',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'xxxxxxxxxx',
  'dbpassword' => 'xxxxxxx',
  'installed' => true,
  
  ),
  
  'objectstore' => array(
        'class' => '\\OC\\Files\\ObjectStore\\S3',
        'arguments' => array(
                'bucket' => 'xxxxxxx',
                'key'    => 'xxxxxxxxxx',
                'secret' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
                'hostname' => 'fra1.digitaloceanspaces.com',
                'port' => 443,
                'use_ssl' => true,
                'region' => 'fra1',
                // required for some non Amazon S3 implementations
                'use_path_style'=>true
        ),
),

);

I’m exhausted about seeking solutions from other web sites and videos. I’m looking for some expert help about the issue

Thanks