Call to undefined function get_supercache_dir()

I recently updated to the newest version of wordpress and the newest version of wp-super-cache.

Now, when I try to access my admin site, I get..

Fatal error: Call to undefined function get_supercache_dir() in /home/vcize2/gearsgamers.net/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 1110

If I delete the wp-super-cache plugin through ftp, I get a blank screen (fatal error) for both the admin site and main website. If I re-upload wp-super-cache then I go back to the php fatal error above.

I have tried the development version as well.

https://www.ads-software.com/extend/plugins/wp-super-cache/