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Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): Nextcloud 14.0.1
Operating system and version (eg, Ubuntu 17.04): Ubuntu 18.04
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.29
PHP version (eg, 7.1): PHP 7.2.10
The issue you are facing:
Internal Server Error
The server was unable to complete your request.
If this happens again, please send the technical details below to the server administrator.
More details can be found in the server log.
Technical details
Remote Address: xx.xx.xx.xxx
Request ID: xxxx
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Open xxx.com/nextcloud
The output of your Nextcloud log in Admin > Logging:
UNABLE TO LOGIN
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
$CONFIG = array (
'instanceid' => 'xxxx',
'passwordsalt' => 'xxxx',
'secret' => 'xxxxx/xxxxx',
'trusted_domains' =>
array (
0 => 'xxx.com',
),
'datadirectory' => '/home/xxx/xxx',
'htaccess.RewriteBase' => '/xxx/',
'dbtype' => 'mysql',
'version' => '14.0.1.1',
'overwrite.cli.url' => 'https://xxx.com/xxx',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'xxxx',
'dbpassword' => 'xxxx',
'installed' => true,
'maintenance' => false,
'memcache.local' => '\\OC\\Memcache\\Redis',
'filelocking.enabled' => 'true',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/var/run/redis/redis.sock',
'port' => 0,
'timeout' => 0.0,
'password' => 'xxx',
),
'cache_path' => '/var/www/xxx.com/html/xxx/cache',
'mail_from_address' => 'xxx',
'mail_smtpmode' => 'sendmail',
'mail_smtpsecure' => 'ssl',
'mail_smtpauthtype' => 'LOGIN',
'mail_domain' => 'xxx.com',
'mail_smtpauth' => 1,
'mail_smtphost' => 'smtp.xxx.com',
'mail_smtpport' => '587',
'mail_smtpname' => 'xxx@xxx.com',
'mail_smtppassword' => 'xxx',
);
The output of your Apache/nginx/system log in /var/log/____:
NONE
robots.txt in the nextcloud folder works. also this error shows with the blue background not white. i can see nextcloud logo. and finally, i do have the recommended nextcloud.conf settings with allowoverride all etc.