"deprecated" can't log-in. never happened before

hi guys! i am totally lost here. been using wp since 2009. never had an issue. haven’t posted since March 2012. the site is https://snocon.com/logic/
the log-in has always been https://snocon.com/logic/wp-login.php
went there today and got the “deprecated” messages shown below.
can you help? thank you. i have always enjoyed wp.

Deprecated: Assigning the return value of new by reference is deprecated in /home/content/s/n/o/snocon1/html/logic/wp-settings.php on line 472

Deprecated: Assigning the return value of new by reference is deprecated in /home/content/s/n/o/snocon1/html/logic/wp-settings.php on line 487

Deprecated: Assigning the return value of new by reference is deprecated in /home/content/s/n/o/snocon1/html/logic/wp-settings.php on line 494

Deprecated: Assigning the return value of new by reference is deprecated in /home/content/s/n/o/snocon1/html/logic/wp-settings.php on line 530

Deprecated: Assigning the return value of new by reference is deprecated in /home/content/s/n/o/snocon1/html/logic/wp-includes/cache.php on line 103

Deprecated: Assigning the return value of new by reference is deprecated in /home/content/s/n/o/snocon1/html/logic/wp-includes/query.php on line 21

Deprecated: Assigning the return value of new by reference is deprecated in /home/content/s/n/o/snocon1/html/logic/wp-includes/theme.php on line 623

Warning: Cannot modify header information – headers already sent by (output started at /home/content/s/n/o/snocon1/html/logic/wp-settings.php:472) in /home/content/s/n/o/snocon1/html/logic/wp-login.php on line 267

Warning: Cannot modify header information – headers already sent by (output started at /home/content/s/n/o/snocon1/html/logic/wp-settings.php:472) in /home/content/s/n/o/snocon1/html/logic/wp-login.php on line 279