Matomo encountered an error: Uncaught Piwik\Exception\DatabaseSchemaIsNewerThanCodebaseException: Your Matomo codebase is running the old version 4.14.2 and we have detected that your Matomo Database has already been upgraded to the newer version 4.15.1. Maybe your Matomo administrators are currently finishing the upgrade process. Please try again in a few minutes. If you still have this issue please contact your Matomo administrator for assistance. in /var/www/piwik/core/FrontController.php:692 Stack trace: #0 /var/www/piwik/core/FrontController.php(387): Piwik\FrontController->throwIfPiwikVersionIsOlderThanDBSchema() #1 /var/www/thegtricks/wp-content/plugins/wp-piwik/classes/WP_Piwik/Request/Php.php(40): Piwik\FrontController->init() #2 /var/www/thegtricks/wp-content/plugins/wp-piwik/classes/WP_Piwik/Request/Php.php(18): WP_Piwik\Request\Php->call() #3 /var/www/thegtricks/wp-content/plugins/wp-piwik/classes/WP_Piwik/Request.php(63): WP_Piwik\Request\Php->request() #4 /var/www/thegtricks/wp-content/plugins/wp-piwik/classes/WP_Piwik.php(1038): WP_Piwik\Request->perform() #5 /var/www/thegtricks/wp-content/plugins/wp-piwik/classes/WP_Piwik.php(1205): WP_Piwik->request() #6 /var/www/thegtricks/wp-content/plugins/wp-piwik/classes/WP_Piwik/TrackingCode.php(16): WP_Piwik->updateTrackingCode() #7 /var/www/thegtricks/wp-content/plugins/wp-piwik/classes/WP_Piwik.php(296): WP_Piwik\TrackingCode->__construct() #8 /var/www/thegtricks/wp-includes/class-wp-hook.php(324): WP_Piwik->addJavascriptCode() #9 /var/www/thegtricks/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #10 /var/www/thegtricks/wp-includes/plugin.php(517): WP_Hook->do_action() #11 /var/www/thegtricks/wp-includes/general-template.php(3068): do_action() #12 /var/www/thegtricks/wp-content/themes/twentyfifteen-child/footer.php(45): wp_footer() #13 /var/www/thegtricks/wp-includes/template.php(790): require_once('...') #14 /var/www/thegtricks/wp-includes/template.php(725): load_template() #15 /var/www/thegtricks/wp-includes/general-template.php(92): locate_template() #16 /var/www/thegtricks/wp-content/themes/twentyfifteen/archive.php(68): get_footer() #17 /var/www/thegtricks/wp-includes/template-loader.php(106): include('...') #18 /var/www/thegtricks/wp-blog-header.php(19): require_once('...') #19 /var/www/thegtricks/index.php(17): require('...') #20 {main} thrown (which lead to: Session must be started before any output has been sent to the browser; output started in /var/www/thegtricks/wp-includes/script-loader.php/2925)