Site is working, admin panel is blank

My site was not working properly when SSL license expired. Now, that I purchased a new SSL the site is up, but the wp-admin is blank.

When changed the code in wp-config to define(‘WP_DEBUG’, true);
that’s what I saw:

Warning: Parameter 1 to wp_default_scripts() expected to be a reference, value given in /home/om2014/public_html/wp-includes/plugin.php on line 579

Notice: The called constructor method for WP_Widget is deprecated since version 4.3.0! Use
__construct()
instead. in /home/om2014/public_html/wp-includes/functions.php on line 3457

Notice: The called constructor method for WP_Widget is deprecated since version 4.3.0! Use
__construct()
instead. in /home/om2014/public_html/wp-includes/functions.php on line 3457

Warning: Illegal string offset ‘remember’ in /home/om2014/public_html/wp-includes/user.php on line 41

Warning: Cannot assign an empty string to a string offset in /home/om2014/public_html/wp-includes/user.php on line 41

Warning: Illegal string offset ‘user_login’ in /home/om2014/public_html/wp-includes/user.php on line 56

Fatal error: Uncaught Error: Cannot create references to/from string offsets in /home/om2014/public_html/wp-includes/user.php:56 Stack trace: #0 /home/om2014/public_html/wp-login.php(806): wp_signon(”, ”) #1 {main} thrown in /home/om2014/public_html/wp-includes/user.php on line 56