Can’t log into WP admin

Hi.
I’ve browsed the forums and tried all the fixes I could find. Just recently I’ve had to change the information on the website but currently when I try to login I get a string of errors. I haven’t changed anything in a long time or messed with wordpress however the moment I need to this happens:

Warning: Illegal string offset ‘remember’ in /home/kycorg/public_html/kyc/wp-includes/user.php on line 39

Warning: Cannot assign an empty string to a string offset in /home/kycorg/public_html/kyc/wp-includes/user.php on line 39

Warning: Illegal string offset ‘user_login’ in /home/kycorg/public_html/kyc/wp-includes/user.php on line 54

Fatal error: Uncaught Error: Cannot create references to/from string offsets in /home/kycorg/public_html/kyc/wp-includes/user.php:54 Stack trace: #0 /home/kycorg/public_html/kyc/wp-login.php(779): wp_signon(”, ”) #1 {main} thrown in /home/kycorg/public_html/kyc/wp-includes/user.php on line 54

I’m on a time crunch and leave on holidays in 2 days so if anyone has the fix I need it would be greatly appreciated.