Connected to config:
'cache'=>array( 'class'=>'system.caching.CMemCache', 'servers'=>array( array('host'=>'localhost', 'port'=>11211), ),
Expansions and other things somehow not found for him
Well, because you have written in plain text that the memcache extension for PHP is required for CMemCache to work. What OS is used by you?
In debian-like OS, an extension is installed like this:
sudo apt-get install memcached php5-memcache sudo service apache2 restart
Source: https://ru.stackoverflow.com/questions/203796/
All Articles