warning: include(): Unable to allocate memory for pool.

Problem:  warning: require_once(): Unable to allocate memory for pool

Solution:

Add these lines to the end of your php.ini file

[xdebug]

apc.enabled=1
apc.shm_segments=1
apc.shm_size=128M
apc.cache_by_default=1
apc.stat=1
apc.rfc1867=1
apc.stat=0

So the trick to change 32M to 128M and the apc.stat=7200 to = 0.

Restart the web server.