Error when loading site

I have just created a child theme of Catch Adaptive Pro and have not yet made any changes to the child CSS yet. However when I preview my site and view the Console log I can see the following error

Invalid 'X-Frame-Options' header encountered when loading 'http://www.bsab.co.uk/Dev2017/?customize_changeset_uuid=665fd1ee-b20e-4f12-9b8e-eae31faff4c6&customize_theme=catch-adaptive-pro-child&customize_messenger_channel=preview-1&customize_autosaved=on': 'ALLOW-FROM http://www.bsab.co.uk/Dev2017/wp-admin/customize.php' is not a recognized directive. The header will be ignored.

Can someone advise what this error means and how I resolve it please. Much thanks