Unhappy E:/ Can't Mount sd card

AT&T G2

I'm trying to update to the latest CM11 nightly. Typically, I download the latest via the CM updater in the About Phone section and then I flash it manually via ClockworkMod 6.0.4.4. However, this time around, after wiping the cache, I tried to wipe the dalvik and also flash the rom all i get is "E:/ Can't Mount sd card"... Any suggestions on how to fix this?

I encountered this once before a couple of weeks ago and I had to format the internal sd card via CWM. I'm hoping to avoid that this time around by seeking help here.