That’s for sure an update plugin error, the best thing you can do is to report to the plugin developers, they may have been aware by now but talk to them to see what happens. When a client comes with a similar problem, I suggest to: Update PHP, probably you are using 5.5. Downgrade the … Read more
I think is an problem of php code, maybe in your functions.phg of the theme. Start debugging feature in WP and see the error messages. add this to wp-config.php or change the constant in the file. define( ‘WP_DEBUG’, TRUE ); Also i think, read this question and his answers, many solutions for the problem.
Seems like you’re running an outdated PHP version (lower than 5.3)? You should update the PHP on your server. Best case to PHP 7+
I’m editing public/wp-includes/functions.php file, not the core one. It used to work. Ths is your problem, never modify files in the wp-includes folder under any circumstances!. When tutorials and articles refer to functions.php, they’re referring to the functions file in the current theme. This file does not always exist but you can create it. I … Read more
Its since wordpress 3.0 http://codex.wordpress.org/Function_Reference/term_exists#Change_Log
Object of class WP_Post could not be converted to string
WSOD on 4.1.1 after migrating from Bluehost to Dreamhost
WordPress displays 500 error on PHP errors
According to the error you are defining WP_CACHE as true somewhere (maybe in wp-config.php?). This way WordPress is looking for a file that doesn’t exist in default installation. Disable it and the error will be gone. You can also create an empty file advanced-cache.php in wp-content/ directory if you are unable to find WP_CACHE
Blank page and 301 redirect