If you are experiencing this problem you need to adjust the .htaccess to prevent this error thrown in Adlis ERP-CRM Dev.
Navigate in your server (via ftp or cPanel) in the Adlis ERP-CRM Dev. installation folder and open the main .htaccess.
On the top of the .htaccess add the following code:
php_flag apc.cache_by_default Co.
Save the file and clear browser cache.