Collabora Online (using Docker) - Errors

I have all the modules mentioned enabled. The .htaccess file looks like this:

# Make sure to enable RewriteRule on your server, and the the RewriteBase is correctly set.
# If your install is accessible on https://yourdomain.tld/pydio, RewriteBase should be /pydio.
# If your install is accessible on https://yourdomain.tld/, RewriteBase should be /.

RewriteEngine on
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*) index.php [L]

#Following lines seem to be necessary if PHP is working
#with apache as CGI or FCGI. Just remove the #
#See http://doc.tiki.org/WebDAV#Note_about_Apache_with_PHP_as_fcgi_or_cgi

#RewriteCond %{HTTP:Authorization} ^(.*)
#RewriteRule ^(.*) - [E=HTTP_AUTHORIZATION:%1]

#Following lines may be necessary for a PHP-FPM setup
# to make sure that authorization is transmitted.
# Just remove the # at the beginning of the line

#SetEnvIf Authorization "(.*)" HTTP_AUTHORIZATION=$1

</IfModule>

AddType application/json .json

The location of pydio is this:
/var/www/pydio/

The apache2.conf looks like this:
Mutex file:${APACHE_LOCK_DIR} default

PidFile ${APACHE_PID_FILE}

Timeout 300

KeepAlive On

MaxKeepAliveRequests 100

KeepAliveTimeout 5


# These need to be set in /etc/apache2/envvars
User ${APACHE_RUN_USER}
Group ${APACHE_RUN_GROUP}

HostnameLookups Off

ErrorLog ${APACHE_LOG_DIR}/error.log

LogLevel warn

# Include module configuration:
IncludeOptional mods-enabled/*.load
IncludeOptional mods-enabled/*.conf

# Include list of ports to listen on
Include ports.conf

<Directory />
        Options FollowSymLinks
        AllowOverride all
        Require all granted
</Directory>

<Directory /usr/share>
        AllowOverride all
        Require all granted
</Directory>

<Directory /var/www/>
        Options Indexes FollowSymLinks
        AllowOverride all
        Require all granted
</Directory>

AccessFileName .htaccess

<FilesMatch "^\.ht">
        Require all denied
</FilesMatch>

LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %O" common
LogFormat "%{Referer}i -> %U" referer
LogFormat "%{User-agent}i" agent

# Include of directories ignores editors' and dpkg's backup files,
# see README.Debian for details.

# Include generic snippets of statements
IncludeOptional conf-enabled/*.conf

# Include the virtual host configurations:
IncludeOptional sites-enabled/*.conf

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet

<VirtualHost *:443>
    ServerName xxxx.xxxx.xx:443

    # SSL configuration, you may want to take the easy route instead and use Lets Encrypt!
    SSLEngine on
    SSLCertificateFile /root/testkey.crt
    #SSLCertificateChainFile /path/to/intermediate_certificate
    SSLCertificateKeyFile /root/testkey.key
    SSLProtocol all -SSLv2 -SSLv3
    SSLCipherSuite ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS
    SSLHonorCipherOrder on

    # Encoded slashes need to be allowed
    AllowEncodedSlashes NoDecode

    # Container uses a unique non-signed certificate
    SSLProxyEngine On
    SSLProxyVerify None
    SSLProxyCheckPeerCN Off
    SSLProxyCheckPeerName Off

    # keep the host
    ProxyPreserveHost On

    # static html, js, images, etc. served from loolwsd
    # loleaflet is the client part of LibreOffice Online
    ProxyPass           /loleaflet https://127.0.0.1:9980/loleaflet retry=0
    ProxyPassReverse    /loleaflet https://127.0.0.1:9980/loleaflet

    # WOPI discovery URL
    ProxyPass           /hosting/discovery https://127.0.0.1:9980/hosting/discovery retry=0
    ProxyPassReverse    /hosting/discovery https://127.0.0.1:9980/hosting/discovery

    # Main websocket
    ProxyPassMatch "/lool/(.*)/ws$" wss://127.0.0.1:9980/lool/$1/ws nocanon

    # Admin Console websocket
    ProxyPass   /lool/adminws wss://127.0.0.1:9980/lool/adminws

    # Download as, Fullscreen presentation and Image upload operations
    ProxyPass           /lool https://127.0.0.1:9980/lool
    ProxyPassReverse    /lool https://127.0.0.1:9980/lool
</VirtualHost>

I still get the same errors as mentioned above. Does anything look odd?