Fixed but there is still one error (see code for error) help please :)

using UnityEngine; using System.Collections; using System; //added to access the enum class

public class BaseCharacter : MonoBehaviour { private string _name; private int _level; private uint _freeExp;

private Attribute[] _primaryAttribute;
private Vital[] _vital;
private Skill[] _skill;


public void Awake () {
    _name = String.Empty;
    _level = 0;
    _freeExp = 0;

    _primaryAttribute = new Attribute[Enum.GetValues(typeof(AttributeName)).Length];
                                      ;
    _vital = new Vital[Enum.GetValues(typeof(VitalName)).Length];
    _skill = new Skill[Enum.GetValues(typeof(SkillName)).Length];

    SetUpPrimaryAttribute();
    SetUpVitals();
    SetUpSkills();
}


public string Name {
    get{ return _name; }
    set{ _name = value;}
}

public int Level {
    get{ return _level; }
    set{ _level = value;}
}

public uint FreeExp {
    get{ return _freeExp; }
    set{ _freeExp = value;}
}

public void AddExp(uint exp) {
    _freeExp += exp;

    CalculateLevel();
}

//take average of all of the players skills and assign that as the player level
public void CalculateLevel() {
}

private void SetUpPrimaryAttribute() {
    for(int cnt = 0; cnt< _primaryAttribute.Length; cnt++) {
        _primaryAttribute[cnt] = new Attribute();
    }
}

private void SetUpVitals() {
    for(int cnt = 0; cnt < _vital.Length; cnt++) {
        _vital[cnt] = new Vital();
    }
}

private void SetUpSkills() {
    for(int cnt = 0; cnt < _skill.Length; cnt++) {
        _skill[cnt] = new Skill();
    }
}

public Attribute GetPrimaryAttribute(int index) {
    return _primaryAttribute[index];
}
public Vital GetVital(int index) {
    return _vital[index];
}
public Skill GetSkill(int index) {
    return _skill[index];
}   

void AddSkillModifier(SkillName skillName, AttributeName attributeName, float value) {

Skill skill = GetSkill((int)skillName);


Attribute primary = GetPrimaryAttribute((int)attributeName);

// Below is my new error --- error CS1729: The type ModifyingAttribute' does not contain a constructor that takes2' arguments

ModifyingAttribute modifier = new ModifyingAttribute(primary, value); 



skill.AddModifier(modifier);

}

private void SetUpVitalModifiers() {
    //health
    GetVital((int)VitalName.Health).AddModifier(new ModifyingAttribute{attribute = GetPrimaryAttribute((int)AttributeName.Constitution), ratio = .5f});
    //energy
    GetVital((int)VitalName.Energy).AddModifier(new ModifyingAttribute{attribute = GetPrimaryAttribute((int)AttributeName.Constitution), ratio = 1});
    //mana
    GetVital((int)VitalName.Mana).AddModifier(new ModifyingAttribute{attribute = GetPrimaryAttribute((int)AttributeName.WillPower), ratio = 1});
}

public void SetUpSkillModifiers() {
// Check comments right side ->
    float m = 0.33f;
    AddSkillModifier(SkillName.Melee_Offence,  AttributeName.Might        , m);
    AddSkillModifier(SkillName.Melee_Offence,  AttributeName.Nimbleness   , m);
    AddSkillModifier(SkillName.Melee_Defence,  AttributeName.Speed        , m);
 AddSkillModifier(SkillName.Melee_Defence,  AttributeName.Constitution , m);
 AddSkillModifier(SkillName.Magic_Offence,  AttributeName.Concentration, m);
    AddSkillModifier(SkillName.Magic_Offence,  AttributeName.WillPower    , m);
    AddSkillModifier(SkillName.Magic_Defence,  AttributeName.Concentration, m);  
    AddSkillModifier(SkillName.Magic_Defence,  AttributeName.WillPower    , m); 
    AddSkillModifier(SkillName.Ranged_Offence, AttributeName.Concentration, m);
    AddSkillModifier(SkillName.Ranged_Offence, AttributeName.Speed        , m);
    AddSkillModifier(SkillName.Ranged_Defence, AttributeName.Speed        , m);
    AddSkillModifier(SkillName.Ranged_Defence, AttributeName.Nimbleness   , m);
}
public void StatUpdate () {
    for(int cnt = 0; cnt < _vital.Length; cnt++)
        _vital[cnt].Update();
    for(int cnt = 0; cnt < _skill.Length; cnt++)
        _skill[cnt].Update();
    }

}