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It looks like your site is not correctly connected to WordPress.com right now. You’re consequently experiencing issues when trying to fetch post information from the WordPress.com REST API.
I would recommend that you either switch to using the WP REST API by setting wpapi to true, or reconnect your site to WordPress.com by going to Jetpack > Dashboard in your admin menu.
If you experience issues reconnecting your site to WordPress.com, you can contact the Jetpack support team for help.
I hope this helps.