导入Excel文件时出错

当我尝试使用laravel 5.1 maatweb包导入excel文件时，我收到以下错误

连载：

'Symfony\Component\HttpFoundation\File\UploadedFile' is not allowed 

function如下：

 public function import() { $file=Input::file("file"); // Excel::load($file, function($reader) Excel::load($file)->chunk(100, function($reader) { $results = $reader->get(); foreach($results as $row): Vlist::create([ 'vname' =>$row->vname, 'vservice' =>$row->vservice, 'vphone' =>$row->vphone, 'vmobile' =>$row->vmobile, 'vemail' =>$row->vemail, 'vcontactperson' =>$row->vcontactperson, 'vaddress' =>$row->vaddress, 'vegpcno' =>$row->vegpcno, 'vcapitallimit' =>$row->vcapitallimit, 'vgrade' =>$row->vgrade, 'vremarks' =>$row->vremarks, 'user_id' =>Auth::user()->id ]); endforeach; }); return redirect('vlist'); }