Call to undefined function get_registered_meta_keys()

  • I just started using this plugin, when I try going to mysite.com/wp-json/wp/v2/posts I get the following error:

    Fatal error: Call to undefined function get_registered_meta_keys() in …wp-content/plugins/rest-api/lib/fields/class-wp-rest-meta-fields.php on line 244

    Am I doing anything wrong?

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