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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, 12.0.2): 13.0.5
Operating system and version (eg, Ubuntu 17.04): Raspbian Stretch
Apache or nginx version (eg, Apache 2.4.25): 2.4.25-3+deb9u5
PHP version (eg, 7.1): 7.0+49
EDIT: Updated currently used version info.
The issue you are facing:
I am currently having a hard time trying to have both NextCloud and AirSonic (a music streaming server) in one Apache2 server. Both are running in a Raspberry Pi 2B+ with the Raspbian build. I added a config for AirSonic, added it, and then restarted the server, but for some reason, when I launch www.somedomain.com/nextcloud, the server says it doesn’t exist. Even the index.php portion of the website is said to not exist. Did I configure my Apache2’s sites enabled wrong for NextCloud?
NextCloud’s Apache2 .conf file:
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
DocumentRoot /var/www/nextcloud
ServerName (redacted)
CustomLog /var/log/apache2/nc-access.log combined
ErrorLog /var/log/apache2/nc-error.log
SSLEngine on
SSLCertificateFile /etc/letsencrypt/live/(redacted)/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/(redacted)/privkey.pem
</VirtualHost>
<Directory /var/www/nextcloud/>
Options +FollowSymlinks
AllowOverride All
<IfModule mod_dav.c>
Dav off
</IfModule>
LimitRequestBody 0
SSLRenegBufferSize 10486000
</Directory>
</IfModule>
AirSonic’s Apache2 .conf file:
<VirtualHost *:80>
ServerName (redacted)
Redirect permanent / (redacted)
</VirtualHost>
<VirtualHost *:443>
SSLEngine On
SSLCertificateFile /etc/letsencrypt/live/(redacted)/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/(redacted)/privkey.pem
SSLProxyEngine on
ServerName (redacted)
LogLevel warn
CustomLog ${APACHE_LOG_DIR}/airsonic-access.log combined
ErrorLog ${APACHE_LOG_DIR}/airsonic-error.log
ProxyPass /airsonic http://127.0.0.1:8080/airsonic
ProxyPassReverse /airsonic http://127.0.0.1:8080/airsonic
RequestHeader set X-Forwarded-Proto "https"
</VirtualHost>
Is this the first time you’ve seen this error?: Yes.
Steps to replicate it:
Whenever a new server wants to be part of the domain (like www.somedomain.com/airsonic or /nextcloud), either one or the other works.
The output of your Nextcloud log in Admin > Logging:
None that are outstanding.
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
Is it just what is in the config.php file (sorry, I just recently joined). Here’s what it is regardless though.
<?php
$CONFIG = array (
'passwordsalt' => '(redacted)',
'secret' => '(redacted)',
'trusted_domains' =>
array (
0 => 'localhost',
1 => '(redacted)',
5 => 'nextcloudpi.local',
3 => '(redacted)',
4 => '(redacted)',
),
'datadirectory' => '/var/www/nextcloud/data',
'overwrite.cli.url' => '(redacted)',
'dbtype' => 'mysql',
'version' => '13.0.5.2',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'ncadmin',
'dbpassword' => '(redacted)',
'installed' => true,
'instanceid' => 'oc7tx5do4iye',
'memcache.local' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/var/run/redis/redis.sock',
'port' => 0,
'timeout' => 0.0,
'password' => '(redacted)',
),
'mail_smtpmode' => 'php',
'mail_smtpauthtype' => 'LOGIN',
'mail_from_address' => 'admin',
'mail_domain' => 'ownyourbits.com',
'overwriteprotocol' => 'https',
'loglevel' => '2',
'log_type' => 'file',
'ldapIgnoreNamingRules' => false,
'ldapProviderFactory' => '\\OCA\\User_LDAP\\LDAPProviderFactory',
'maintenance' => false,
);
The output of your Apache/nginx/system log in /var/log/____:
Since the log is a bit long, it’s filtered by a few hours.
...
192.168.1.1 - - [31/Aug/2018:21:16:19 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:16:20 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:16:33 -0700] "PROPFIND /remote.php/webdav/UCSD%20Schedule.pdf HTTP/2.0" 207 580 "-" "Microsoft-WebDAV-MiniRedir/10.0.17134"
192.168.1.1 - - [31/Aug/2018:21:16:38 -0700] "GET /ocs/v2.php/apps/notifications/api/v1/notifications?format=json HTTP/1.1" 200 2326 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:16:49 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:16:50 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:17:19 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:17:20 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:17:49 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:17:50 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:17:59 -0700] "PROPFIND /remote.php/webdav/UCSD%20Schedule.pdf HTTP/2.0" 207 580 "-" "Microsoft-WebDAV-MiniRedir/10.0.17134"
192.168.1.1 - - [31/Aug/2018:21:18:19 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:18:20 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:18:49 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:18:50 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:19:03 -0700] "PROPFIND /remote.php/webdav/UCSD%20Schedule.pdf HTTP/2.0" 207 580 "-" "Microsoft-WebDAV-MiniRedir/10.0.17134"
192.168.1.1 - - [31/Aug/2018:21:19:20 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 4690 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:19:20 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:19:49 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:19:50 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:20:19 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:20:20 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:20:49 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:20:50 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:21:19 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:21:20 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:21:38 -0700] "GET /ocs/v2.php/apps/notifications/api/v1/notifications?format=json HTTP/1.1" 200 2326 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:21:49 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:21:50 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:22:19 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:22:20 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:22:49 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:22:50 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:23:19 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:23:20 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"
192.168.1.1 - - [31/Aug/2018:21:23:49 -0700] "PROPFIND /remote.php/dav/files/ncp/ HTTP/1.1" 207 1352 "-" "Mozilla/5.0 (Windows) mirall/2.3.3 (build 1) (Nextcloud)"
192.168.1.1 - - [31/Aug/2018:21:23:50 -0700] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2265 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0"