$('#modal-import-json-protocol').on('hidden.bs.modal', function () {
    $('#pio_no_file_error_span').empty();
})
<% if @protocolsio_too_big %>
$('#modal-import-json-protocol').modal('hide');
HelperModule.flashAlertMsg(I18n.t('my_modules.protocols.load_from_file_size_error',
                                  { size: GLOBAL_CONSTANTS.FILE_MAX_SIZE_MB ) }, 'danger');
<% elsif @protocolsio_general_error %>
  $('#pio_no_file_error_span').addClass('has-error').html('<span class="help-block"> <%= t('protocols.import_export.load_file_error') %></span>');
<% elsif @protocolsio_invalid_file %>
$('#modal-import-json-protocol').modal('hide');
HelperModule.flashAlertMsg(' <%= t('my_modules.protocols.load_from_file_invalid_error') %>','danger');
<% elsif @protocolsio_no_file %>
$('#pio_no_file_error_span').addClass('has-error').html('<span class="help-block"> <%= t('teams.parse_sheet.errors.no_file_selected') %></span>');
<% @protocolsio_no_file = false %>
<% else %>
  $('#modal-import-json-protocol').modal('hide');
  $('#protocolsio-preview-modal-target').html(
    "<%= j render(:partial => 'protocols/import_export/import_json_protocol_preview_modal') %>"
  );
  $('#modal-import-json-protocol-preview').modal('show');
  $('.modal').on('hidden.bs.modal', function (e) {
    if($('.modal').hasClass('in')) {
      $('body').addClass('modal-open');
    }
  });
<% end %>
$("#protocols_io_form")[0].reset();
$('#protocols_io_form').trigger("reset");