Matomo encountered an error: Uncaught Exception: Piwik and/or some plugins have been upgraded to a new version. --> Please run the update process first. See documentation: https://matomo.org/docs/update/ in /data/websites/stats.simplement-web.com/plugins/CoreUpdater/CoreUpdater.php:67 Stack trace: #0 [internal function]: Piwik\Plugins\CoreUpdater\CoreUpdater->dispatch() #1 /data/websites/stats.simplement-web.com/core/EventDispatcher.php(141): call_user_func_array() #2 /data/websites/stats.simplement-web.com/core/Piwik.php(845): Piwik\EventDispatcher->postEvent() #3 /data/websites/stats.simplement-web.com/core/FrontController.php(379): Piwik\Piwik::postEvent() #4 /data/websites/nat.fam-martel.eu/wp-content/plugins/wp-piwik/classes/WP_Piwik/Request/Php.php(40): Piwik\FrontController->init() #5 /data/websites/nat.fam-martel.eu/wp-content/plugins/wp-piwik/classes/WP_Piwik/Request/Php.php(18): WP_Piwik\Request\Php->call() #6 /data/websites/nat.fam-martel.eu/wp-content/plugins/wp-piwik/classes/WP_Piwik/Request.php(63): WP_Piwik\Request\Php->request() #7 /data/websites/nat.fam-martel.eu/wp-content/plugins/wp-piwik/classes/WP_Piwik.php(1044): WP_Piwik\Request->perform() #8 /data/websites/nat.fam-martel.eu/wp-content/plugins/wp-piwik/classes/WP_Piwik.php(1206): WP_Piwik->request() #9 /data/websites/nat.fam-martel.eu/wp-content/plugins/wp-piwik/classes/WP_Piwik/TrackingCode.php(16): WP_Piwik->updateTrackingCode() #10 /data/websites/nat.fam-martel.eu/wp-content/plugins/wp-piwik/classes/WP_Piwik.php(295): WP_Piwik\TrackingCode->__construct() #11 /data/websites/nat.fam-martel.eu/wp-includes/class-wp-hook.php(307): WP_Piwik->addJavascriptCode() #12 /data/websites/nat.fam-martel.eu/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters() #13 /data/websites/nat.fam-martel.eu/wp-includes/plugin.php(474): WP_Hook->do_action() #14 /data/websites/nat.fam-martel.eu/wp-includes/general-template.php(3042): do_action() #15 /data/websites/nat.fam-martel.eu/wp-content/themes/twentytwenty/header.php(23): wp_head() #16 /data/websites/nat.fam-martel.eu/wp-includes/template.php(770): require_once('...') #17 /data/websites/nat.fam-martel.eu/wp-includes/template.php(716): load_template() #18 /data/websites/nat.fam-martel.eu/wp-includes/general-template.php(48): locate_template() #19 /data/websites/nat.fam-martel.eu/wp-content/themes/twentytwenty/singular.php(12): get_header() #20 /data/websites/nat.fam-martel.eu/wp-includes/template-loader.php(106): include('...') #21 /data/websites/nat.fam-martel.eu/wp-blog-header.php(19): require_once('...') #22 /data/websites/nat.fam-martel.eu/index.php(17): require('...') #23 {main} thrown (which lead to: Session must be started before any output has been sent to the browser; output started in /data/websites/nat.fam-martel.eu/wp-includes/class.wp-styles.php/214)