ErrorInCalculation

So, I've recently attempted to start playing "Fallout: New Vegas" and I of course tried to download modifications for my game as the base game is simply not sufficient to my needs and desires for my gaming experience. I am a complete idiot when in regards to modding and the modding community and despite reading a thread posted on the this website previously, I still could not figure out what exactly was wrong with my game. If anyone could be of assistance, please help me!