Warning: require_once(rest.inc.php): failed to open stream: No such file or directory in /htdocs/wp-content/plugins/optimizePressPlugin/lib/vendor/maropost-api-class/maropost.class.php on line 3

Fatal error: require_once(): Failed opening required 'rest.inc.php' (include_path='/htdocs/wp-content/themes/page-builder-framework/assets/kirki/:/htdocs/wp-content/themes/page-builder-framework/assets/kirki/core:.:/usr/share/php') in /htdocs/wp-content/plugins/optimizePressPlugin/lib/vendor/maropost-api-class/maropost.class.php on line 3