laravel file move

$file = Input::file("nameFile");
$clientName = $file -> getClientOriginalName();
$tmpName = $file ->getFileName();
$url = $file->getRealPath();
echo $url; D:\wwwrot\facsimilemedia\public
echo $clientName; 171801_114747673522_2.jpg
$file->move('uploads',$clientName);

提示 ：
FileException in UploadedFile.php line 235:
The file "171801_114747673522_2.jpg" exceeds the upload limit defined in your form.

求指教