Try to create or check the .htaccess file for the wordpress site. Create or edit the syntax use for the .htaccess file to the one indicated below.
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
Once created or updated, upload then try to check the website.