自定义进程无法启动 class processCheckDevActiveTask not exists

<?php
use Workerman\Timer;
use Workerman\Worker;

class CheckDevActiveTask
{
    public function __construct()
    {
        var_dump("CheckDevActiveTask");
    }
    public function onWorkerStart()
    {
        var_dump("onWorkerStart");
        // 每隔10秒检查一次数据库是否有新用户注册
    }
}

在config\process.php中增加：
    'checkdevactivetask'  => [
        'handler'  => process\CheckDevActiveTask::class,
        'reloadable'  => false,
        'constructor' => [
        ]
    ],

process error: class process\CheckDevActiveTask not exists