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Sorry to hear you’re facing problems 
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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, 20.0.5): 20.0.5
Operating system and version (eg, Ubuntu 20.04): Ubuntu 18.04
Apache or nginx version (eg, Apache 2.4.25): 2.4.48
PHP version (eg, 7.4): 7.4
The issue you are facing:
After enabling the Extractor(?) add-on, I lost all access to the Nextcloud interface.
Is there a way for me to put nextcloud into maintenance mode via command line inferface so that I can upgrade Nextcloud 20.0.9 or or 21.0.?
Is this the first time you’ve seen this error? (Y/N):Y
Steps to replicate it:
- Go to URL cloud.esprimme.com
The output of your Nextcloud log in Admin > Logging:
Here is a snippet from ../logs/access_log
[30/Apr/2021:19:26:06 -0400] "GET /index.php/204 HTTP/1.1" 500 4137 "-" "Mozilla/5.0 (Android) Nextcloud-android/3.15.1"
173.238.111.22 - - [30/Apr/2021:19:26:06 -0400] "GET /index.php/204 HTTP/1.1" 500 4137 "-" "Mozilla/5.0 (Android) Nextcloud-android/3.15.1"
173.238.111.22 - - [30/Apr/2021:19:26:06 -0400] "GET /index.php/204 HTTP/1.1" 500 4137 "-" "Mozilla/5.0 (Android) Nextcloud-android/3.15.1"
173.238.111.22 - - [30/Apr/2021:19:26:06 -0400] "GET /index.php/204 HTTP/1.1" 500 4137 "-" "Mozilla/5.0 (Android) Nextcloud-android/3.15.1"
173.238.106.177 - - [01/May/2021:11:24:28 -0400] "GET / HTTP/1.1" 500 4152 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:88.0) Gecko/20100101 Firefox/88.0"
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'ocb06ckk12kr',
'passwordsalt' => 'xxx',
'secret' => 'xxx',
'trusted_domains' =>
array (
0 => 'cloud.esprimme.com',
),
'memcache.local' => '\\OC\\Memcache\\APCu',
'datadirectory' => '/home/cloud/public_html/data',
'dbtype' => 'mysql',
'version' => '20.0.5.2',
'overwrite.cli.url' => 'https://cloud.esprimme.com',
'dbname' => 'nextcloud',
'dbhost' => 'localhost:3306',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'oc_esprimme',
'dbpassword' => 'xxx',
'installed' => true,
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'tls',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'support',
'mail_domain' => 'esprimme.com',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtphost' => 'mailout.easymail.ca',
'mail_smtpport' => '465',
'mail_smtpauth' => 1,
'mail_smtpname' => 'support@esprimme.com',
'mail_smtppassword' => **************
'maintenance' => false,
'mysql.utf8mb4' => true,
);
The output of your Apache/nginx/system log in /var/log/____:
Don't know which log is needed...