Did you Add this
Code:
extension=php_memcache.dll
[Memcache]
extension=php_memcache.dll
memcache.allow_failover = 1
memcache.max_failover_attempts=20
memcache.chunk_size =8192
memcache.default_port = 11211
You Need extension into php.ini - open php.ini and find all the extensions.
sometimes the extension is there but its not in use (have a ; before it) then uncomment it.