CM no Installing Updates?

[AC Question]

I have a Nook HD+, rooted with cyanogenmod installed on it and everything. I updated to Mockingbird, installed, found .zip in internal storage, rebooted to recovery, tried installing in boot menu, but it keeps saying installation aborted, with the Android man laying down with an exclamation mark. I tried rebooting, the system, and data wipe/factory reset, but it won't go anymore, just load the Cyanogenmod logo, go through a couple of processes, and return to the same screen, I don't know what I'm doing wrong. On the top left, it says EMMC CWM_based recovery v6. 0. 3. 2