I'm getting a similar error at step 4 of the README configuration instructions. "Type of item to reference" is Point. "Point type" is Default. I'm using the Basic Page content type just for testing. Also I'm not seeing how you get to the path for "My points" in your screenshot. I'm using Drupal 10.2.3. Am I missing a module maybe? Also your screenshot shows "Type of item to reference" is Content. What am I missing?