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Sorry to hear you’re facing problems 
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Nextcloud version 21.0.1
Operating system Ubuntu 20.04
Apache version 2.4
PHP version 7.4
The issue you are facing:
I am setting up a nextcloud server for the first time and its all working but when i went to edit the config files trusted domains i get an internal error on the website and cant access the site. Everything appears to be fine in the config file but it still wont work
Is this the first time you’ve seen this error? (Y/N):
y
The output of your Nextcloud log in Admin > Logging:
PHP Parse error: syntax error, unexpected 'array' (T_ARRAY), expecting ')' in /var/www/nextcloud/config/config.php on line 7
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => '************',
'passwordsalt' => '******************************',
'secret' => '*************************************************',
'trusted_domains' =>
array (
0 => 'localhost',
1 => '*****.*****************.***',
2 => '192.168.***.***',
),
'datadirectory' => '/var/www/nextcloud/data',
'dbtype' => 'mysql',
'version' => '21.0.1.1',
'overwrite.cli.url' => 'http://192.168.***.***',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => '**************',
'installed' => true,
'memcache.local' => '\OC\Memcache\APCu',
);