GeoDirectory shows this message on the Add Listing page when the post type being added has frontend submissions switched off. It is a setting on each post type, and it is easy to tick by accident because it sits among the advanced settings.

Turn frontend adding back on

1. Go to Places > Settings > General (or the same screen for your other post type, such as Events > Settings > General).
2. Click Show Advanced at the top of the settings so the advanced options appear. Hidden Advanced Settings explains the toggle.
3. Untick Disable frontend add.
4. Save, then reload your Add Listing page.

If the setting is already unticked

• Check the link you followed. A URL such as /add-listing/?listing_type=gd_place asks for a specific post type. If that post type does not exist or is misspelled, you will get “The listing type is invalid or does not exist.” instead.
• Check the Default Post Type setting on the GD > Add Listing block or shortcode on that page. If it names a post type that has frontend adding disabled, the form will not load.
• Make sure GeoDirectory > Settings > General > Pages has your page selected as the Add listing page. Create an “Add Listing” Page walks through setting it up.

If the page title shows a raw placeholder such as %%pt_single%%, that is usually the same problem: the page is not set as the Add listing page, or the form could not find a post type to load.