4.2.3 Spark Error

Something is wrong with your setup. The Toolbar should never load from CLI (spark). app/Config/Events.php:

PHP Code:

    if (CI_DEBUG && ! is_cli()) {
        Events::on('DBQuery', 'CodeIgniter\Debug\Toolbar\Collectors\Database::collect');
        Services::toolbar()->respond();
    } 


Make sure that file and spark are updates to the latest framework-equivalent versions.