W3 Total cache – Version 0.9.5.1 is incompatible with WordPress 4.7 according to a post on WordPress.org
“you may need to remove it to access your site (Removing the plugin directory is not enough, you also need to remove the db.php, advanced-cache.php and object-cache.php files manually from the wp-content/ directory).”
2 thoughts on “W3 Total cache incompatible with WordPress 4.7”
W3 Total cache plugin still appears to be giving problems for many users, 28 people say broken. Details at https://wordpress.org/plugins/w3-total-cache/
WP Super Cache seems to work OK with WordPress 4.7
Info at: https://en-gb.wordpress.org/plugins/wp-super-cache/