Class 'QrCode' not found ?

之前还是正常的，怎么就报错了？

<?php

namespace App\Http\Controllers\Api\V1;

use App\Models\Customer;
use App\Models\Consult;
use Illuminate\Http\Request;
use App\Repositories\Eloquent\ConsultRepository;
use App\Http\Requests\Api\ConsultRequest;
use Illuminate\Support\Facades\Auth;
use App\Transformers\ConsultTransformer;
use QrCode;

class ConsultController extends Controller
{
    /**
     * 预约订单二维码
    */
    public function qrCode(Consult $consult)
    {
        $qrcode['qrcode'] = QrCode::size(460)->generate(route('consults.show', $consult->id));
        return $this->response->array($qrcode);
    }

}