command执行出错的消息如何获取

定时任务执行失败的错误消息如何获取？

<?php
namespace App\Console;
use App\Traits\HelpersTrait;
use Illuminate\Console\Scheduling\Schedule;
use Illuminate\Foundation\Console\Kernel as ConsoleKernel;
class Kernel extends ConsoleKernel
{
    protected function schedule(Schedule $schedule)
    {
        $schedule->command('send:business_daily')->dailyAt('10:00')
            ->onSuccess(function (){
                HelpersTrait::pushErrToQYGroup("经营日报发送成功");
            })->onFailure(function (){
                //执行失败的错误消息如何获取
                HelpersTrait::pushErrToQYGroup("经营日报发送失败");
            });
    }
}