phpBBB error: PHP Warning: in file [ROOT]/phpbb/db/driver/mysqli.php

Sometimes when you move your forum to a new server you can encounter weird errors in phpBB. The error above is a simple fix. I moved a forum to a new Ubuntu server and got the error, PHP Warning: in file [ROOT]/phpbb/db/driver/mysqli.php. To fix this phpBB error I removed the production folder inside the cache folder of the forum root directory

sudo rm -Rf cache/production/

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