Error with Unity ( C# )

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class CreateNewCharacter : MonoBehaviour {

	private BasePlayer newPlayer;
	private string playerName = "Enter Name";
	Text charText;
	private bool soldier = true;
	private bool pilot;
	private bool citizen;
	private bool create;


	// Use this for initialization

	void Awake(){

	
	}

	void Start () {

	}
	
	// Update is called once per frame
	void Update () {




	}


	void OnGUI()
	{
		create = GUI.Button(new Rect((Screen.width/2),(Screen.height/2)+25,100,20),"Create");
		playerName = GUI.TextArea(new Rect((Screen.width/2)-100,(Screen.height/2)-25,200,25),playerName ,15);//limited to 15 letters
		if (GUI.Toggle(new Rect((Screen.width/2)-100,(Screen.height/2),100,20),soldier, "Soldier")) {
			soldier = true;
			pilot = false;
			citizen = false;
		}
		
		if (GUI.Toggle(new Rect((Screen.width/2)-100,(Screen.height/2)+25,100,20),pilot, "Pilot")) {
			pilot = true;
			soldier = false;
			citizen = false;
		}
		
		if (GUI.Toggle(new Rect((Screen.width/2)-100,(Screen.height/2)+50,100,20),citizen, "Citizen")) {
			pilot = false;
			soldier = false;
			citizen = true;
		}

		if (create == true){
			Debug.Log("Button was pressed");
			if(soldier){
				newPlayer.PlayerClass = new BaseSoldierClass();
			}else if(pilot){
				newPlayer.PlayerClass = new BasePilotClass();
			}else if(citizen){
				newPlayer.PlayerClass = new BaseCitizenClass();
			}
			newPlayer.PlayerLevel = 1;
			newPlayer.Stamina = newPlayer.PlayerClass.Stamina;
			newPlayer.Velocity = newPlayer.PlayerClass.Velocity;
			newPlayer.Intellect = newPlayer.PlayerClass.Intellect;
			newPlayer.Strength = newPlayer.PlayerClass.Strength;
			newPlayer.Observation = newPlayer.PlayerClass.Observation;
			newPlayer.Luck = newPlayer.PlayerClass.Luck;
			newPlayer.PlayerName = playerName;
			
			//StoreNewPlayerInfo();
			//SaveInformation.SaveAllInformation();
			
			Debug.Log("Player Name : " + newPlayer.PlayerName);
			Debug.Log("Player Class : " + newPlayer.PlayerClass.CharacterClassName);
			Debug.Log("Player Level : " + newPlayer.PlayerLevel);
			Debug.Log("Player Stamina : " + newPlayer.Stamina);
			Debug.Log("Player Velocity : " + newPlayer.Velocity);
			Debug.Log("Player Intellect : " + newPlayer.Intellect);
			Debug.Log("Player Strength : " + newPlayer.Strength);
			Debug.Log("Player Observation : " + newPlayer.Observation);
			Debug.Log("Player Luck : " + newPlayer.Luck);
			Application.LoadLevel("Scene2");



			
		}

using UnityEngine;
using System.Collections;

public class BaseSoldierClass : BaseCharacterClass {
	
	public BaseSoldierClass() {
		CharacterClassName = "Soldato";
		CharacterClassDescription = "E' un soldato addestrato per combattere i gay";
		Stamina = 15;
		Velocity = 15;
		Strength = 20;
		Intellect = 10;
		Observation = 10;
		Luck = 10;
	}
	
}