Laravel5.6 数据导出生成 Excel 表格？

在做数据导出时，composer加载插件之后，开发时提示错误，代码片段为

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use Maatwebsite\Excel\Excel;

class ExportController extends Controller
{
public function export()
{
$cellData = [
['学号','姓名','成绩'],
['10001','AAAAA','99'],
['10002','BBBBB','92'],
['10003','CCCCC','95'],
['10004','DDDDD','89'],
['10005','EEEEE','96'],
];
Excel::create('学生成绩',function($excel) use ($cellData){
$excel->sheet('score', function($sheet) use ($cellData){
$sheet->rows($cellData);
});
})->export('xls');
}
}

提示错误信息为create方法不存在 这是laravel插件得问题吗？有做过得嘛？麻烦告知