Seeing blank pages / PHP Warning

I’m seeing blank pages on the site this morning and found many lines like this in the error log

[10-Jun-2014 15:28:39] PHP Warning:  chmod() [<a href='function.chmod'>function.chmod</a>]: No such file or directory in /home/freespir/public_html/wp-content/plugins/wordfence/lib/wfCache.php on line 168
[10-Jun-2014 15:30:10] PHP Warning:  mkdir() [<a href='function.mkdir'>function.mkdir</a>]: Disk quota exceeded in /home/freespir/public_html/wp-content/plugins/wordfence/lib/wfCache.php on line 196
[10-Jun-2014 15:30:10] PHP Warning:  file_put_contents(/home/freespir/public_html/wp-content/wfcache/chicagoyachtcruises.com_/~~~~_wfcache.html) [<a href='function.file-put-contents'>function.file-put-contents</a>]: failed to open stream: No such file or directory in /home/freespir/public_html/wp-content/plugins/wordfence/lib/wfCache.php on line 163
[10-Jun-2014 15:30:10] PHP Warning:  chmod() [<a href='function.chmod'>function.chmod</a>]: No such file or directory in /home/freespir/public_html/wp-content/plugins/wordfence/lib/wfCache.php on line 164
[10-Jun-2014 15:30:10] PHP Warning:  file_put_contents(/home/freespir/public_html/wp-content/wfcache/chicagoyachtcruises.com_/~~~~_wfcache.html_gzip) [<a href='function.file-put-contents'>function.file-put-contents</a>]: failed to open stream: No such file or directory in /home/freespir/public_html/wp-content/plugins/wordfence/lib/wfCache.php on

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