Could you change these two lines to:

```
$this->message('This feature is experimental.');
$this->message('The uninstall process will try to delete all pages, templates and fields defined in this module json, so if you included directives to merely modify existing pages, templates or fields, you should add a "prefab" property to each of those and set it to "true".');
$this->message('Nothing will be deleted until you click the Confirm button below.');
```

This makes it a little more user friendly (I thought I broke everything because of the `$this->error()`). It's personal taste though. Also the third message (Nothing will be deleted...) makes it feel more secure to play around with.