Double slashes on WordPress Admin URL redirects to wp-login

I can only access my Dashboard through http://www.example.com/wp-login.php All links inside dashboard have double slashes before wp-admin.. like “www.example.com//wp-admin/…” And when I access this URL, Server redirects me to wp-login again…

My .htaccess file is the WP default

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

Any clue about it?

Thanks