Memcache Error? "Could not find specified socket in poll list."

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http://serverfault.com – For some reason recently I've been getting this error in my apache error log on my server. We have a single instance of memcached running on our Mac OSX 10.7 server. (20014)Internal error: Unknown memcached error while writing: Could not find specified socket in poll list. I can't find anything about this error message online :. Does anyone have any idea what could cause it or how I can try debugging it? There's a memcached-tools(?) function on linux, but it doesn't seem to be on the Mac... (HowTos)