Error mounting /sdcard/.android_secure!

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http://androidforums.com – Hi, I'm looking to sell my old galaxy nexus, as I've bought a SIII, so I wiped everything off the phone. Unfortunately I had enabled the encryption which is refusing to be removed. I'm not a techy guy at all, so looking on some of the threads here has totally confused me. My phone looks like it was a Verizon phone but the previous owner has unlocked it. When I try to do a full factory reset using the 'hold down volume buttons' thingy I get the following error: Error mounting /sdcard/.android_secure! In layman's terms, what does this mean and how do I go about removing the encryption? (General)