When plugin is activated, it is impossible to edit taxonomies in admin area. When i go to custom taxonomies i see only this message - " Fatal error: Call to undefined function filter_var() in ***/wp-content/plugins/advanced-custom-fields/core/controllers/everything_fields.php on line 266 " I tried different versions of WP and Advanced Custom Field, but nothing works. It works only when plugin is disabled.
Can you please tell me how to fix this??
Many thanks in advance.