重定向之前Mojo :: IOLoop计时器的问题

Question

我的Mojolicious控制器中有一个sub，当通过http帖子上传csv文件时调用该子控件。上传文件后，将显示一条消息，说明“您将在x秒内重定向”。所以我想实现Mojo :: IOLoop :: Delay和作为回调我使用redirect语句。但我得到Morbo的以下错误：

Mojo::Reactor::EV: Timer failed: Transaction already destroyed at /usr/local/share/perl/5.22.1/Mojolicious/Plugin/DefaultHelpers.pm line 168.

控制器代码：

sub upload {
    my $self = shift;
      # Check file size
      return $self->render(text => 'File is too big.', status => 200)
      if $self->req->is_limit_exceeded;

  # Process uploaded file
  return $self->redirect_to('/') unless my $newCsv = $self->param('fileToUpload');
  my $size = $newCsv->size;
  my $name = $newCsv->filename;
  my $delay = 2;
  $self->render(text => "Thanks for uploading $size byte file $name.<br>
    You will be redirected in $delay seconds");
  Mojo::IOLoop->timer($delay => sub {
    $self->redirect_to('/');
    });
}