PHP error (notice) when adding a new page/post/cpt about intervention HOT 10 CLOSED

return [
    'application' => [
        'site' => [
            'membership'    => false,
            'default-role'  => 'editor',
            'timezone'      => 'America/Vancouver',
            'date-format'   => 'F j, Y',
            'time-format'   => 'g:i a',
            'week-starts'   => 'Sun',
        ],
        'writing' => [
            'emoji' => false,
        ],
        'discussion' => [
            'post.ping-flag' => false,
            'post.ping-status' => false,
            'post.comments' => false,
            'avatars' => false,
        ],
        'media' => [
            'mimes.svg' => true,
        ],
    ],
    'wp-admin.all' => [
        'common.adminbar.wp',
        'common.adminbar.comments',
        'common.adminbar.user.howdy' => 'Hello,',
        'common.adminbar.user.avatar',
        'common.adminbar.user.profile',
        'common.footer.credit' => 'Created for 900 Degrees Wood-Fired Pizza by AMT Marketing.',
        'common.tabs.help',
        'dashboard.home.welcome',
        'dashboard.home.notices',
        'dashboard.home.activity',
        'dashboard.home.right-now',
        'dashboard.home.recent-comments',
        'dashboard.home.incoming-links',
        'dashboard.home.plugins',
        'dashboard.home.quick-draft',
        'dashboard.home.drafts',
        'dashboard.home.news',
        'comments',
        'comments.all',
        'posts.title' => 'Blog',
        'posts.all.title.page' => 'Blog Posts',
        'posts.all.title.menu' => 'All Blog Posts',
        'posts.item.trackbacks',
        'posts.item.discussion',
        'pages.item.discussion',
    ],
];