Get this – #VALUE!

Hello i have been trying to make a price calculator, this i my formula – (bp + aoc2 + wbi)

and i get this in my total box – #VALUE!

bp, aoc2 and wbi ID’s are all multiple choice elements.

I can not see why it is giving me this, can someone please help ?

Many Thanks
Cameron

http://wordpress.org/extend/plugins/jazzy-forms/