Fatal error: Uncaught Error: Interface "WPOAuth2\GrantType\GrantTypeInterface" not found in /var/www/eintrachtpodcast/wp-content/plugins/oauth2-provider/library/WPOAuth2/GrantType/RefreshToken.php:14 Stack trace: #0 {main} thrown in /var/www/eintrachtpodcast/wp-content/plugins/oauth2-provider/library/WPOAuth2/GrantType/RefreshToken.php on line 14