unable to login after adding cache

info from host:

Error log shows

[17-Jun-2026 08:21:23 UTC] PHP Fatal error: Uncaught Error: Call to undefined function __() in /home/lisasart/public_html/blog/wp-admin/includes/file.php:16
Stack trace:
#0 /home/lisasart/public_html/blog/wp-content/object-cache.php(32): require_once()
#1 /home/lisasart/public_html/blog/wp-content/object-cache.php(596): ObjectCacheDisk->__construct()
#2 /home/lisasart/public_html/blog/wp-content/object-cache.php(482): WP_Object_Cache->__construct(”)
#3 /home/lisasart/public_html/blog/wp-includes/load.php(897): wp_cache_init()
#4 /home/lisasart/public_html/blog/wp-settings.php(151): wp_start_object_cache()
#5 /home/lisasart/public_html/blog/wp-config.php(74): require_once(‘/home/lisasart/…’)
#6 /home/lisasart/public_html/blog/wp-load.php(50): require_once(‘/home/lisasart/…’)
#7 /home/lisasart/public_html/blog/wp-login.php(12): require(‘/home/lisasart/…’)
#8 {main}
thrown in /home/lisasart/public_html/blog/wp-admin/includes/file.php on line 16

What do I do to fix this?

Lisa G

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