Community forum memory error

Here is error log:

Warning: include_once() [function.include-once]: Unable to allocate memory for pool. in drupal_settings_initialize() (line 712 of /var/www/domains/couchbase.com/www/htdocs/communities/includes/bootstrap.inc).
Warning: require_once() [function.require-once]: Unable to allocate memory for pool. in _drupal_bootstrap_page_cache() (line 2306 of /var/www/domains/couchbase.com/www/htdocs/communities/includes/bootstrap.inc).
Warning: require_once() [function.require-once]: Unable to allocate memory for pool. in _drupal_bootstrap_database() (line 2396 of /var/www/domains/couchbase.com/www/htdocs/communities/includes/bootstrap.inc).
Warning: require_once() [function.require-once]: Unable to allocate memory for pool. in _drupal_bootstrap_variables() (line 2413 of /var/www/domains/couchbase.com/www/htdocs/communities/includes/bootstrap.inc).

• See more at: http://www.couchbase.com/communities/q-and-a/couchbase-210-211-freeze-upgrade-windows#sthash.YOEbLMpf.dpuf