What causes such an error?

Question

PHP

MemCacheDriver: FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught exception 'Exception'.

2014/09/29 13:40:49 [error] 6617#0: *41 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught exception 'Exception' with message 'Could not installed memcache' in /home/tracker/www/classes/cache/MemCacheDriver.class.php:27
Stack trace:
#0 /home/tracker/www/include/core.php(48): MemCacheDriver->__construct()
#1 /home/tracker/www/include/bittorrent.php(125): require_once('/home/tracker/w...')
#2 /home/tracker/www/index.php(31): require('/home/tracker/w...')
#3 {main}
  thrown in /home/tracker/www/classes/cache/MemCacheDriver.class.php on line 27" while reading response header from upstream, client: 127.0.0.1, server: localhost, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "localhost"

Why the error?

Answer 1

It also says: Could not installed memcache

Answer 2

Something like this:

posts (публикации)
id, type_id, title, descriprion, ...

post_types (тип публикаций)
id, name, title, ...

post_fields (дополнительные поля)
id, type_id, post_id, content...

post_field_types (тип дополнительных полей)
id, post_type_id, name, title, content, ...