WordPress – Upgrading Disqus Comments causes 404 error, permission denied

I’m trying to install Discus to my WordPress website. When I go to the configuration page, I get the message “Upgrade Disqus Comments – You need to upgrade your database to continue.” with a button to upgrade. When I click on upgrade, I get a 404 error page, with the following error message.

Forbidden You don’t have permission to access
/moshop/wp-admin/edit-comments.php on this server. Additionally, a 404
Not Found error was encountered while trying to use an ErrorDocument
to handle the request.

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I tried changing the permission of edit-comments.php from 664 to 777, even tried other combinations, but the problem is still present.

The .htaccess file in the wordpress’s root directory is currently as follows.

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /moshop/
RewriteRule ^index.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /moshop/index.php [L]
</IfModule>
# END WordPress

Thanks in advance for any reply I can get.

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