laravel 安装excel 出错？大神们帮帮看看。谢谢啦。
错误如图：
http://jingpin.jikexueyuan.com/article/44015.html
学号：@ViewBag.userId讲师：@ViewBag.teacherName
简介：@ViewBag.remark
错误如图：
http://jingpin.jikexueyuan.com/article/44015.html
学号：@ViewBag.userId讲师：@ViewBag.teacherName
简介：@ViewBag.remark