新版本中小程序的模板消息报错

[leeyifei]

Exception 'yii\base\UnknownPropertyException' with message 'Getting unknown property: abei2017\wx\mini\template\Template::accessToken'

in /home/www-data/workspace/kangyi/php/shopping/vendor/yiisoft/yii2/base/Component.php:154

当前版本 1.3.4
`
class Template extends Driver {

const API_SEND_TMPL = 'https://api.weixin.qq.com/cgi-bin/message/wxopen/template/send?access_token=';

/**
 * 发送模板消息
 *
 * @param $toUser
 * @param $templateId
 * @param $formId
 * @param $data
 * @param array $extra
 */
public function send($toUser,$templateId,$formId,$data,$extra = []){
    $params = array_merge([
        'touser'=>$toUser,
        'template_id'=>$templateId,
        'form_id'=>$formId,
        'data'=>$data,
    ],$extra);
    $response = $this->post(self::API_SEND_TMPL.$this->accessToken->getToken(),$params)->setFormat(Client::FORMAT_JSON)->send();

    return $response->getContent();
}

}
`

accesstoken未定义