Exception when saving the view

[jonnyhocks]

Hi,

I've been using the article on your website as a guide to create a Views filter for a project I'm working on and planning to upload to drupal.org.

Unfortunately, when saving my view with your custom filter example I am getting this error:
InvalidArgumentException: The configuration property display.default.display_options.filters.node_titles.value.my_title doesn't exist. in Drupal\Core\Config\Schema\ArrayElement->get() (line 74 of core/lib/Drupal/Core/Config/Schema/ArrayElement.php).

Any advice on how to fix this would be appreciated!