When I try and create a page, the composer is blank all of a sudden. I'm using 8.5.4 and it was working fine a couple weeks ago. Nothing has changed in my hosting environment to my knowledge either. It is set to PHP7.2. This and the attached are the error I get in Chrome console:

Whoops\Exception\ErrorException thrown with message "Illegal length modifier specified 'f' in s[np]printf call"

Stacktrace:
#2 Whoops\Exception\ErrorException in /home/b3a7a75/public_html/ramser/concrete/src/Cache/Driver/FileSystemStashDriver.php:46
#1 Whoops\Run:handleError in /home/b3a7a75/public_html/ramser/concrete/vendor/filp/whoops/src/Whoops/Run.php:433
#0 Whoops\Run:handleShutdown in [internal]:0