Dictionary Returning Null Value

I am having trouble using a dictoinary. Whenever i try to get the value it returns null every time. I am alos getting this warning

You are trying to create a MonoBehaviour using the 'new' keyword. This is not allowed. MonoBehaviours can only be added using AddComponent(). Alternatively, your script can inherit from ScriptableObject or no base class at all UnityEngine.MonoBehaviour:.ctor() GamePiece:.ctor(String, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Boolean, List`1) WarhammerBoard:loadModels() (at Assets/WarhammerBoard.cs:56) WarhammerBoard:Start() (at Assets/WarhammerBoard.cs:13)

 public TextAsset characterModels;
     private string[] dataLines;
     private Dictionary<string, GamePiece> characterModelsBoard = new Dictionary<string, GamePiece>();
     private List<Weapon> gPWeapon = new List<Weapon>();
     // Use this for initializatio
     void Start () 
     {
         loadModels ();
     }
     
     // Update is called once per frame
     void Update () {
         
     }
     
     void loadModels()
     {
         
         dataLines = characterModels.text.Split('\n');
         string[][] dataPairs = new string[dataLines.Length][];
         int lineNum = 0;
         foreach (string line in dataLines)
         {
             dataPairs[lineNum++] = line.Split(',');
         }
         foreach (string[] line in dataPairs) 
         {
             string modelName = line[0];
             string WS = line[1];
             string BS = line[2];
             string S = line[3];
             string T = line[4];
             string W = line[5];
             string I  = line[6];
             string A = line[7];
             string Ld = line[8];
             string Sv = line[9];
             string Indep = line[10];
             string weapOne = line[11];
             string weapTwo = line[12];
             string weapThree = line[13];
 
             if(modelName == "Hellbrute")
             {
                 characterModelsBoard.Add (modelName, new GamePiece(modelName,int.Parse (WS),int.Parse (BS),
                                                                   int.Parse(S),int.Parse(T),int.Parse(W),int.Parse(I),
                                                                   int.Parse(A),int.Parse(Ld),int.Parse(Sv),gPWeapon));
             }
             else
             {
                 characterModelsBoard.Add(modelName,new GamePiece(modelName,int.Parse(WS),int.Parse(BS),int.Parse (S),
                                                                  int.Parse(T),int.Parse (W),int.Parse(I),int.Parse (A),
                                                                  int.Parse(Ld),int.Parse(Sv),bool.Parse(Indep),gPWeapon));
             }
         }
     }

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 public class GamePiece : MonoBehaviour {
 
     // Use this for initialization
         string name;
         int weaponSkill;
         int ballisticSkill;
         int strength;
         int toughness;
         int wounds;
         int initiative;
         int attacks;
         int leadership;
         int armourSave;
         int front;
         int side;
         int rear;
         int hullPoint;
         bool independent;
         List<Weapon> gPWeapon = new List<Weapon>();
         
         public GamePiece(string name,int weaponSkill, int ballisticSkill, int strength, int toughness,
                          int wounds, int initiative, int attacks, int leadership, int armourSave, 
                          bool independent,List<Weapon> gPWeapon)
         {
             this.name = name;
             this.weaponSkill = weaponSkill;
             this.ballisticSkill = ballisticSkill;
             this.strength = strength;
             this.toughness = toughness;
             this.wounds = wounds;
             this.initiative = initiative;
             this.attacks = attacks;
             this.leadership = leadership;
             this.armourSave = armourSave;
             this.gPWeapon = gPWeapon;
             this.independent = independent;
         }
         
         public GamePiece(string name,int weaponSkill, int ballisticSkill, int strength, int front, int side, int rear,
                          int initative, int attacks, int hullPoint, List<Weapon> gPWeapon)
         {
             this.name = name;
             this.weaponSkill = weaponSkill;
             this.ballisticSkill = ballisticSkill;
             this.strength = strength;
             this.front = front;
             this.side = side;
             this.rear = rear;
             this.initiative = initative;
             this.attacks = attacks;
             this.hullPoint = hullPoint;
             this.gPWeapon = gPWeapon;
         }
     
 }