Guys, please help me. My website is totally down! I can't even access the wp-admin to log into my wordpress..
First I got this error when trying access the wp-admin:
Fatal error: Cannot redeclare wp_is_large_network() (previously declared in wp-includes/ms-functions.php:2369) in wp-admin/includes/ms.php on line 714
Per accidentally I removed the wp-admin folder. I don't know exactly what I did, but I restored the folder with a back-up. The site was running after this, but I still had to solve the log in... So I messed around even more.
I noticed the wp-admin and wp-includes folders were duplicated at some weird locations. I've deleted those. But it still wasn't solved. Than I restored the wp-admin and wp-includes folders from a old back-up. Messed around more. Result: My site is now totally down!!
I'm such a stupid person to mess around with FTP while not having excellent knowledge about is.
Please someone help!!
(I'm running WordPress Multisite)