Multisite Showing Blank Directory

I’ve configured multisites and setup the network (sub directory). The main site works fine. However, when I go one of the other sites, it just shows a blank directory listing. I can also access the sites in the admin.

I tried adding Options FollowSymLinks and I get a 403 error of Directory index forbidden by Options directive

htaccess

RewriteEngine On
RewriteBase /~username/
RewriteRule ^index\.php$ - [L]
# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [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|admin|includes).*) $1 [L]
RewriteRule  ^[_0-9a-zA-Z-]+/(.*\.php)$ $1 [L]
RewriteRule . index.php [L]

config

define('WP_ALLOW_MULTISITE', true);
define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', false);
$base = '/~username/';
define('DOMAIN_CURRENT_SITE', '1.1.1.1');
define('PATH_CURRENT_SITE', '/~username/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);