Same problem
Warning: strpos() expects parameter 1 to be string, object given in /home/…./wp-includes/post.php on line 188
Warning: preg_match() expects parameter 2 to be string, object given in /home/…../wp-includes/post.php on line 188
Catchable fatal error: Object of class WP_Error could not be converted to string in /home/……/public_html/wp-includes/post.php on line 189
