Ukrainian hryvnia banknotes are seen in a photo illustration shot in Kiev

Fatal error: Uncaught wfWAFStorageFileException: Unable to verify temporary file contents for atomic writing. in /var/www/kolomyia_today/data/www/kolomyia.today/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/storage/file.php:52 Stack trace: #0 /var/www/kolomyia_today/data/www/kolomyia.today/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/storage/file.php(659): wfWAFStorageFile::atomicFilePutContents('/var/www/kolomy...', '<?php exit('Acc...') #1 [internal function]: wfWAFStorageFile->saveConfig('livewaf') #2 {main} thrown in /var/www/kolomyia_today/data/www/kolomyia.today/wp-content/plugins/wordfence/vendor/wordfence/wf-waf/src/lib/storage/file.php on line 52