Subsite Dashboard and subdomain gets redirected to install.php

Hello,
Hope someone can help me this is really frustrating. I have a wordpess multisite created and have got it working fine by following the instruction on how to set up a multisite. I installed it under a domain called pn-onepage.co.nz.

However when I create another site and try to access the dashboard i get redirected to this https://deannecraig.pn-onepage.co.nz/wp-admin/install.php which is asking me to install wordpress.

RewriteEngine On
RewriteBase /onepage/
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|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

this is my htaccess. I’m not sure what I’m doing wrong, I have created a wildcard subdomain in justhost. Any help would be much appreciated.