Error on plugin activation and creating new page

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Trying to write an OOP plugin, migrating from a script monkey plugin.

I need to create a number of pages of plugin activation, and have the following code:

  public function __construct()
  {
    global $wpdb;
    $this->tablename = $wpdb->prefix . 'arch_church_nominations';
    $this->activate();
  }

  public function activate()
  {
    $this->createTable();   // this works fine
    $this->createPages();
  }

  ...

  private function createPages()
  {
    require_once(ABSPATH . "wp-includes/pluggable.php");

    $nominationPost = array(
      'post_title'    => wp_strip_all_tags('Nominations'),
      'post_content'  => 'Nominations parent',
      'post_status'   => 'publish',
      'post_author'   => 1,
      'post_type'     => 'page',
    );

    // Insert the post into the database
    $this->$parentId = wp_insert_post($nominationPost);   // <-- this line
  }
}

$archChurchNominations = new ArchChurchNominations();

The noted line above if included causes the following error:

Notice: Trying to get property 'feeds' of non-object in /Users/[USERNAME]/Projects/wordpress/wp-includes/post.php on line 4482

However the exact same code snippet works fine, if not in an OOP plugin. What's wrong with my config please?

本文标签： Error on plugin activation and creating new page