Cannot modify header information - headers already sent by (output started at /home/forge/staging.aci.uk.net/web/app/plugins/seo-by-rank-math/vendor/mythemeshop/wordpress-helpers/src/class-notification.php:89) (500 Internal Server Error)

Exception

ErrorException

in /home/forge/staging.aci.uk.net/web/wp/wp-includes/rest-api/class-wp-rest-server.php (line 1717)

* Any LWS that occurs between field-content MAY be replaced with a
* single SP before interpreting the field value or forwarding the
* message downstream.
*/
$value = preg_replace( '/\s+/', ' ', $value );
header( sprintf( '%s: %s', $key, $value ) );
}
/**
* Sends multiple HTTP headers.
*

in /home/forge/staging.aci.uk.net/vendor/roots/acorn/src/Roots/Acorn/Bootstrap/HandleExceptions.php -> handleError (line 54)

* @throws \ErrorException
*/
public function handleError($level, $message, $file = '', $line = 0, $context = [])
{
try {
parent::handleError($level, $message, $file, $line, $context);
} catch (Throwable $e) {
if (! apply_filters('acorn/throw_error_exception', true, $e)) {
return false;
}

HandleExceptions->handleError()

header() in /home/forge/staging.aci.uk.net/web/wp/wp-includes/rest-api/class-wp-rest-server.php (line 1717)

* Any LWS that occurs between field-content MAY be replaced with a
* single SP before interpreting the field value or forwarding the
* message downstream.
*/
$value = preg_replace( '/\s+/', ' ', $value );
header( sprintf( '%s: %s', $key, $value ) );
}
/**
* Sends multiple HTTP headers.
*

WP_REST_Server->send_header() in /home/forge/staging.aci.uk.net/web/wp/wp-includes/rest-api/class-wp-rest-server.php (line 282)

if ( isset( $_GET['_jsonp'] ) ) {
$jsonp_callback = $_GET['_jsonp'];
}
$content_type = ( $jsonp_callback && $jsonp_enabled ) ? 'application/javascript' : 'application/json';
$this->send_header( 'Content-Type', $content_type . '; charset=' . get_option( 'blog_charset' ) );
$this->send_header( 'X-Robots-Tag', 'noindex' );
$api_root = get_rest_url();
if ( ! empty( $api_root ) ) {
$this->send_header( 'Link', '<' . esc_url_raw( $api_root ) . '>; rel="https://api.w.org/"' );

WP_REST_Server->serve_request() in /home/forge/staging.aci.uk.net/web/wp/wp-includes/rest-api.php (line 394)

// Fire off the request.
$route = untrailingslashit( $GLOBALS['wp']->query_vars['rest_route'] );
if ( empty( $route ) ) {
$route = '/';
}
$server->serve_request( $route );
// We're done.
die();
}

rest_api_loaded() in /home/forge/staging.aci.uk.net/web/wp/wp-includes/class-wp-hook.php (line 307)

// Avoid the array_slice() if possible.
if ( 0 == $the_['accepted_args'] ) {
$value = call_user_func( $the_['function'] );
} elseif ( $the_['accepted_args'] >= $num_args ) {
$value = call_user_func_array( $the_['function'], $args );
} else {
$value = call_user_func_array( $the_['function'], array_slice( $args, 0, (int) $the_['accepted_args'] ) );
}
}
} while ( false !== next( $this->iterations[ $nesting_level ] ) );

WP_Hook->apply_filters() in /home/forge/staging.aci.uk.net/web/wp/wp-includes/class-wp-hook.php (line 331)

*
* @param array $args Parameters to pass to the callback functions.
*/
public function do_action( $args ) {
$this->doing_action = true;
$this->apply_filters( '', $args );
// If there are recursive calls to the current action, we haven't finished it until we get to the last one.
if ( ! $this->nesting_level ) {
$this->doing_action = false;
}

WP_Hook->do_action() in /home/forge/staging.aci.uk.net/web/wp/wp-includes/plugin.php (line 524)

if ( ! isset( $wp_filter['all'] ) ) {
$wp_current_filter[] = $hook_name;
}
$wp_filter[ $hook_name ]->do_action( $args );
array_pop( $wp_current_filter );
}
/**

do_action_ref_array() in /home/forge/staging.aci.uk.net/web/wp/wp-includes/class-wp.php (line 398)

*
* @since 2.1.0
*
* @param WP $wp Current WordPress environment instance (passed by reference).
*/
do_action_ref_array( 'parse_request', array( &$this ) );
return true;
}
/**

WP->parse_request() in /home/forge/staging.aci.uk.net/web/wp/wp-includes/class-wp.php (line 770)

* @param string|array $query_args Passed to parse_request().
*/
public function main( $query_args = '' ) {
$this->init();
$parsed = $this->parse_request( $query_args );
$this->send_headers();
if ( $parsed ) {
$this->query_posts();

WP->main() in /home/forge/staging.aci.uk.net/web/wp/wp-includes/functions.php (line 1330)

* @param string|array $query_vars Default WP_Query arguments.
*/
function wp( $query_vars = '' ) {
global $wp, $wp_query, $wp_the_query;
$wp->main( $query_vars );
if ( ! isset( $wp_the_query ) ) {
$wp_the_query = $wp_query;
}
}

wp() in /home/forge/staging.aci.uk.net/web/wp/wp-blog-header.php (line 16)

// Load the WordPress library.
require_once __DIR__ . '/wp-load.php';
// Set up the WordPress query.
wp();
// Load the theme template.
require_once ABSPATH . WPINC . '/template-loader.php';
}

require('/home/forge/staging.aci.uk.net/web/wp/wp-blog-header.php') in /home/forge/staging.aci.uk.net/web/index.php (line 6)

<?php
/**
* WordPress View Bootstrapper
*/
define('WP_USE_THEMES', true);
require __DIR__ . '/wp/wp-blog-header.php';

Stack Trace

ErrorException
ErrorException: Cannot modify header information - headers already sent by (output started at /home/forge/staging.aci.uk.net/web/app/plugins/seo-by-rank-math/vendor/mythemeshop/wordpress-helpers/src/class-notification.php:89) at /home/forge/staging.aci.uk.net/web/wp/wp-includes/rest-api/class-wp-rest-server.php:1717 at Illuminate\Foundation\Bootstrap\HandleExceptions->handleError() (/home/forge/staging.aci.uk.net/vendor/roots/acorn/src/Roots/Acorn/Bootstrap/HandleExceptions.php:54) at Roots\Acorn\Bootstrap\HandleExceptions->handleError() at header() (/home/forge/staging.aci.uk.net/web/wp/wp-includes/rest-api/class-wp-rest-server.php:1717) at WP_REST_Server->send_header() (/home/forge/staging.aci.uk.net/web/wp/wp-includes/rest-api/class-wp-rest-server.php:282) at WP_REST_Server->serve_request() (/home/forge/staging.aci.uk.net/web/wp/wp-includes/rest-api.php:394) at rest_api_loaded() (/home/forge/staging.aci.uk.net/web/wp/wp-includes/class-wp-hook.php:307) at WP_Hook->apply_filters() (/home/forge/staging.aci.uk.net/web/wp/wp-includes/class-wp-hook.php:331) at WP_Hook->do_action() (/home/forge/staging.aci.uk.net/web/wp/wp-includes/plugin.php:524) at do_action_ref_array() (/home/forge/staging.aci.uk.net/web/wp/wp-includes/class-wp.php:398) at WP->parse_request() (/home/forge/staging.aci.uk.net/web/wp/wp-includes/class-wp.php:770) at WP->main() (/home/forge/staging.aci.uk.net/web/wp/wp-includes/functions.php:1330) at wp() (/home/forge/staging.aci.uk.net/web/wp/wp-blog-header.php:16) at require('/home/forge/staging.aci.uk.net/web/wp/wp-blog-header.php') (/home/forge/staging.aci.uk.net/web/index.php:6)

ErrorException

ErrorException:
Cannot modify header information - headers already sent by (output started at /home/forge/staging.aci.uk.net/web/app/plugins/seo-by-rank-math/vendor/mythemeshop/wordpress-helpers/src/class-notification.php:89)

  at /home/forge/staging.aci.uk.net/web/wp/wp-includes/rest-api/class-wp-rest-server.php:1717
  at Illuminate\Foundation\Bootstrap\HandleExceptions->handleError()
     (/home/forge/staging.aci.uk.net/vendor/roots/acorn/src/Roots/Acorn/Bootstrap/HandleExceptions.php:54)
  at Roots\Acorn\Bootstrap\HandleExceptions->handleError()
  at header()
     (/home/forge/staging.aci.uk.net/web/wp/wp-includes/rest-api/class-wp-rest-server.php:1717)
  at WP_REST_Server->send_header()
     (/home/forge/staging.aci.uk.net/web/wp/wp-includes/rest-api/class-wp-rest-server.php:282)
  at WP_REST_Server->serve_request()
     (/home/forge/staging.aci.uk.net/web/wp/wp-includes/rest-api.php:394)
  at rest_api_loaded()
     (/home/forge/staging.aci.uk.net/web/wp/wp-includes/class-wp-hook.php:307)
  at WP_Hook->apply_filters()
     (/home/forge/staging.aci.uk.net/web/wp/wp-includes/class-wp-hook.php:331)
  at WP_Hook->do_action()
     (/home/forge/staging.aci.uk.net/web/wp/wp-includes/plugin.php:524)
  at do_action_ref_array()
     (/home/forge/staging.aci.uk.net/web/wp/wp-includes/class-wp.php:398)
  at WP->parse_request()
     (/home/forge/staging.aci.uk.net/web/wp/wp-includes/class-wp.php:770)
  at WP->main()
     (/home/forge/staging.aci.uk.net/web/wp/wp-includes/functions.php:1330)
  at wp()
     (/home/forge/staging.aci.uk.net/web/wp/wp-blog-header.php:16)
  at require('/home/forge/staging.aci.uk.net/web/wp/wp-blog-header.php')
     (/home/forge/staging.aci.uk.net/web/index.php:6)

Symfony Exception

ErrorException

HTTP 500 Internal Server Error

Cannot modify header information - headers already sent by (output started at /home/forge/staging.aci.uk.net/web/app/plugins/seo-by-rank-math/vendor/mythemeshop/wordpress-helpers/src/class-notification.php:89)

Exception

ErrorException

Stack Trace