Can't updload csv file with upload->do_upload()

My mimes.php :

PHP Code:

$mimes = array( 'hqx' => 'application/mac-binhex40',
 'cpt' => 'application/mac-compactpro',
 'csv' => array('text/x-comma-separated-values', 'text/comma-separated-values', 'application/octet-stream', 'application/vnd.ms-excel', 'application/x-csv', 'text/x-csv', 'text/csv', 'application/csv', 'application/excel', 'application/vnd.msexcel'),
 ...
); 


Mi view :

PHP Code:

<?=form_open('prof/import', 'class="form-inline"')?>
      <div class="form-group">
        <label for="inputFile">Sélectionnez un fichier :</label>
        <input type="file" class="form-control" id="inputFile">
      </div>
      <button type="submit" class="btn btn-default">Submit</button>
    <?=form_close()?>

And I add my capture.
$this->upload->display_errors() return : Le type de fichier que vous tentez d'envoyer n'est pas autorisé. ( = The type of file you are trying to send is not allowed.).

I have no problem with other file.