Unable to render HTML from Markdown

I am going through an online course on Laravel. This course is using the League\commonmark package for converting markdown to html.

Whenever the package is used in the app, I get:

 Unable to find corresponding renderer for block type League\CommonMark\Block\Element\Document 

The app uses the following presenter to do the conversion.

 class PagePresenter extends AbstractPresenter
{
  protected $markdown;

  public function __construct($object, CommonMarkConverter $markdown)
  {
    $this->markdown = $markdown;
    parent::__construct($object);
  }

   public function contentHtml()
   {
    return $this->markdown->convertToHtml($this->content);
   } 
}

Can anyone point me in the right direction?

That happens because the IoC is resolving the dependencies for CommonMarkConverter, specifically Environment which is instantiated with all null properties.

You can probably resolve this by using a Laravel specific integration: https://github.com/GrahamCampbell/Laravel-Markdown

Or you can bind and instance to the service container this way:

In your AppServiceProvider, register method add this:

$this->app->singleton('Markdown', function ($app) {

    // Obtain a pre-configured Environment with all the CommonMark parsers/renderers ready-to-go
    $environment = \League\CommonMark\Environment::createCommonMarkEnvironment();

    // Define your configuration:
    $config = ['html_input' => 'escape'];

    // Create the converter
    return new \League\CommonMark\CommonMarkConverter($config, $environment);
});

Now remove CommonMarkConverter from your Presenter constructor add use app('Markdown'):

class PagePresenter extends AbstractPresenter {
  protected $markdown;

  public function __construct($object)
  {
    $this->markdown = app('Markdown');
    parent::__construct($object);
  }

   public function contentHtml()
   {
    return $this->markdown->convertToHtml($this->content);
   } 
}