MSP430 G2452 ADC Problem - CCS Error: 'unable to read'

Hi everyone,

I am trying out ADC on my MSP430 G2452 for the first time, so I am not 100% sure how it all works. I want to measure my 12 volt battery's voltage for a solar power transfer switch i'm building.

Whether or not anything is connected to the pins, I get the following errors:

Here's the code sample I tried: http://pastebin.com/Z5e2S8CZ

It would be tremendously helpful if I could finally get past this problem. In addition to the transfer switch, I have so many projects that require analog to digital conversion. 

Thank you for your time. :)