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Multisite Dashboard not working

I’m attempting to arrange a multisite setting with subdirectories, however after I add a brand new web site after which go to the dashboard of the brand new web site, it reveals a totally white web page with the hyperlinks to the completely different admin menus and the hyperlinks all result in a white web page saying “File not found”.

Here’s a screenshot of what the admin web page seems to be like https://imgur.com/a/gRVEiX3

That is my htaccess file:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content material|admin|contains).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*.php)$ $2 [L]
RewriteRule . index.php [L]
</IfModule>

# END WordPress

And that is my multisite part in wp-config.php:

outline('WP_ALLOW_MULTISITE', true);
outline('MULTISITE', true);
outline('SUBDOMAIN_INSTALL', false);
outline('DOMAIN_CURRENT_SITE', 'fresenia.man.poznan.pl');
outline('PATH_CURRENT_SITE', '/');
outline('SITE_ID_CURRENT_SITE', 1);
outline('BLOG_ID_CURRENT_SITE', 1);