faospark on "[Plugin: Wordfence Security] Php warnings , i had to disable the falcon engine"

i was using performance boost of the falcon engine and a few days ago i cleared the cache. then i started get reports that my domain was basically just a white screen when i checked the error log and i got this a lot of this

www.domain.com/index.php
PHP Warning:  file_put_contents(): Exclusive locks are not supported for this stream in /wp-content/plugins/wordfence/lib/wfCache.php on line 163
PHP Warning:  file_put_contents(): Exclusive locks are not supported for this stream in /wp-content/plugins/wordfence/lib/wfCache.php on line 167

i did some trouble shooting like increasing the memory but nothing happened so
i stopped falcon engine and the warnings stopped but my question is
is the error more related to my server?

btw im on wordpress Network mode

https://wordpress.org/plugins/wordfence/