Internal Server Error 500 on Multisite

I tried setting up the multisite function on wordpress, and wanted to be able to have unique domain names for each site, and so I goofed around with both .htaccess and wp-config.php, and even installed a plugin or two that I was instructed to install by the internet. Wasn’t untill later I found out that plugins arn’t neccesarry anymore, and that my webhoster (one.com) actually offers redirects with the ability to show the requested domain.

So I managed to get the multisite function up and running, and I created a subdomain site, but from the network, as I clicked on “controlpanel” on the new website, I just get a 500 Internal Server Error. I can’t even edit the site. And the same thing happens when I try and visit the site directly. The unique domain I bought is brilleetui.no and the subdomain sitename is brilleetui.lillebrille.no/

Even if I try to go into the wp-admin of the new site, it just gives me the same error. I have no idea what I did wrong.

It might be .htaccess, wp-config.php or even the locations of the files and folders, cause I managed to double click on a few files in between, and then it suddennly said “file succesfully transfered”. I used Filezilla for this.

Please help.

I almost wish I can just restart this whole thing from where I first was with the single site, and follow the updated ste by step. I did make a backup of the site once it was a single site, but as I tried to re-setup the backup, it said “the backup is from a single site, and you’re trying to set the backup on to a multisite network”. If I just delete the code from wp-config.php:

/* Multisite */
define( ‘WP_ALLOW_MULTISITE’, true );

define(‘MULTISITE’, true);
define(‘SUBDOMAIN_INSTALL’, true);
define(‘DOMAIN_CURRENT_SITE’, ‘www.lillebrille.no’);
define(‘PATH_CURRENT_SITE’, ‘/’);
define(‘SITE_ID_CURRENT_SITE’, 1);
define(‘BLOG_ID_CURRENT_SITE’, 1);

Could I then just restore the backup, then start all over?

The page I need help with: [log in to see the link]