Uncaught wfWAFStorageFileException: Unable to save temporary file for atomic writing.
in /var/www/norfolkchambers/wordpress/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/storage/file.php on line 34

Call stack:

1. wfWAFStorageFile::atomicFilePutContents()
   wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/storage/file.php:658
2. wfWAFStorageFile::saveConfig()