Nextcloud server returns access error

Hi Everyone! would be grateful for any support provided coz I’m a rookie in this business.
Yesterday I managed to install and setup the Nextcloud server based on the manual at Techno Dad’s Life youtube channel.

But once I tried to connect the Server via https://******* the system returns the error that says:
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 webserver log.

I checked the log files and foud the following:
Letsencypt error log file says:
2021/01/19 16:31:53 [error] 435#435: 144 nextcloud could not be resolved (110: Operation timed out), client:, server: plombir., request: “GET /nextcloud/index.php/204 HTTP/1.1”, host: “********”

Nextcloud error log file says :
2021/01/19 16:18:12 [error] 368#368: *22 FastCGI sent in stderr: “PHP message: PHP Parse error: syntax error, unexpected ‘‘dbtype’’ (T_CONSTANT_ENCAPSED_STRING), expecting ‘)’ in /config/www/nextcloud/config/config.php on line 16” while reading upstream, client:, server: _, request: “GET /favicon.ico HTTP/2.0”, upstream: “fastcgi://”, host: “”, referrer: “

The cofig.php file details are below:

<?php $CONFIG = array ( 'memcache.local' => '\\OC\\Memcache\\APCu', 'datadirectory' => '/data', 'instanceid' => '**************', 'passwordsalt' => '**************', 'secret' => '5*************', 'trusted_domains' => array ( 0 => '192.168.1.***:444', 1 => '*******', ), 'overwrite.cli.url' => 'https://********', 'overwritehost' => '*********', 'overwriteprotocol' => 'https' 'dbtype' => 'mysql', 'version' => '', 'dbname' => 'nextcloud', 'dbhost' => '192.168.1.****:3306', 'dbport' => '', 'dbtableprefix' => 'oc_', 'mysql.utf8mb4' => true, 'dbuser' => '************', 'dbpassword' => '*********', 'installed' => true, ); Any hints lads where do I have to dig? Thx once again, sorry for not perfect language command, it is not my mother's language.