catch-updater-plugin-update-checker.php on line 221 error

I recently started getting the following error in the Wordpress dashboard. Using Catch Responsive Pro v3.8 with a small child theme that makes some minor CSS changes. Warning: The URL https://catchthemes.com/update-notifier/catch-updater/catch_updater_meta_data.json?checking_for_updates=1&installed_version=1.4 does not point to a valid plugin metadata file. HTTP response code is 503 (expected: 200) in /usr/home/ucwadmin/public_html/wp-content/plugins/catch-updater/inc/catch-updater-plugin-update-checker.php on line 221 Anyone know what's causing this? Thanks, Alex