( ! ) Fatal error: Uncaught Error: Call to undefined function wp_is_valid_utf8() in C:\wamp64\www\webportal\wp-includes\formatting.php on line 2287
( ! ) Error: Call to undefined function wp_is_valid_utf8() in C:\wamp64\www\webportal\wp-includes\formatting.php on line 2287
Call Stack
#	Time	Memory	Function	Location
1	0.0001	385552	{main}( )	...\index.php:0
2	0.0001	385856	require( 'C:\wamp64\www\webportal\wp-blog-header.php )	...\index.php:17
3	0.0001	386272	require_once( 'C:\wamp64\www\webportal\wp-load.php )	...\wp-blog-header.php:13
4	0.0002	387048	require_once( 'C:\wamp64\www\webportal\wp-config.php )	...\wp-load.php:50
5	0.0012	479528	require_once( 'C:\wamp64\www\webportal\wp-settings.php )	...\wp-config.php:96
6	0.2762	27798064	create_initial_taxonomies( )	...\wp-settings.php:513
7	0.2762	27798808	register_taxonomy( $taxonomy = 'category', $object_type = 'post', $args = ['hierarchical' => TRUE, 'query_var' => 'category_name', 'rewrite' => FALSE, 'public' => TRUE, 'show_ui' => TRUE, 'show_admin_column' => TRUE, '_builtin' => TRUE, 'capabilities' => ['manage_terms' => 'manage_categories', 'edit_terms' => 'edit_categories', 'delete_terms' => 'delete_categories', 'assign_terms' => 'assign_categories'], 'show_in_rest' => TRUE, 'rest_base' => 'categories', 'rest_controller_class' => 'WP_REST_Terms_Controller'] )	...\taxonomy.php:63
8	0.2762	27799352	WP_Taxonomy->__construct( $taxonomy = 'category', $object_type = 'post', $args = ['hierarchical' => TRUE, 'query_var' => 'category_name', 'rewrite' => FALSE, 'public' => TRUE, 'show_ui' => TRUE, 'show_admin_column' => TRUE, '_builtin' => TRUE, 'capabilities' => ['manage_terms' => 'manage_categories', 'edit_terms' => 'edit_categories', 'delete_terms' => 'delete_categories', 'assign_terms' => 'assign_categories'], 'show_in_rest' => TRUE, 'rest_base' => 'categories', 'rest_controller_class' => 'WP_REST_Terms_Controller'] )	...\taxonomy.php:532
9	0.2762	27799352	WP_Taxonomy->set_props( $object_type = 'post', $args = ['hierarchical' => TRUE, 'query_var' => 'category_name', 'rewrite' => FALSE, 'public' => TRUE, 'show_ui' => TRUE, 'show_admin_column' => TRUE, '_builtin' => TRUE, 'capabilities' => ['manage_terms' => 'manage_categories', 'edit_terms' => 'edit_categories', 'delete_terms' => 'delete_categories', 'assign_terms' => 'assign_categories'], 'show_in_rest' => TRUE, 'rest_base' => 'categories', 'rest_controller_class' => 'WP_REST_Terms_Controller'] )	...\class-wp-taxonomy.php:290
10	0.2762	27803360	sanitize_title_with_dashes( $title = 'category_name', $raw_title = ???, $context = ??? )	...\class-wp-taxonomy.php:378