I tend to get the Magento Can’t get filling percentage error when I’m running multiple CMS’s and websites on one machine as they all need different modules to run. The symptoms you see are when you try to load any page in the front end of Magento you see an error and a report number. The reports are kept in the code base in the directory:
var/report
If you load the report which has been created by Magento the error tends to looks like: [crayon-600527f197744230008994/] This issue happens because memcache is not running or installed on the system.
To install it type:
sudo apt-get install memcached
To start memcache or restart [...]