Warning: require_once(/var/www/html/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/waf.php): Failed to open stream: Cannot allocate memory in /var/www/html/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/init.php on line 18

Fatal error: Uncaught Error: Failed opening required '/var/www/html/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/waf.php' (include_path='.:/usr/local/lib/php') in /var/www/html/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/init.php:18
Stack trace:
#0 /var/www/html/wp-content/plugins/wordfence/waf/bootstrap.php(40): require_once()
#1 /var/www/html/wordfence-waf.php(6): include_once('...')
#2 {main}
  thrown in /var/www/html/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/init.php on line 18