Script help

i have errors in this script that i have no idea whats wrong with them.

these are the 2 errors

Assets/Characterclasses/BaseCharacter.cs(77,25): error CS0029: Cannot implicitly convert type `Attribute' to `Vital'

Assets/Characterclasses/BaseCharacter.cs(83,25): error CS0029: Cannot implicitly convert type `Attribute' to `Skill'

 using UnityEngine;
 using System.Collections;
 using System;
 
 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];
         
         
         SetupPrimaryAttributes();
         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();
     }
     
     public void CalculateLevel() {
     }
     
     private void SetupPrimaryAttributes() {
         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 Attribute();
         }
     }
     
     private void SetupSkills() {
         for(int cnt = 0; cnt < _skill.Length; cnt++) {
             _skill[cnt] = new Attribute();
         }
     }
     
     public Attribute GetPrimaryAttribute(int index) {
         return _primaryAttribute[index];
     }
     
     public Vital GetVital(int index) {
         return _vital[index];
     }
     
     public Skill GetSkill(int index) {
         return _skill[index];
     }
     
     private void SetupVitalModifiers() {
     GetVital((int)VitalName.Health).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Vitality), .5f));
     
     GetVital((int)VitalName.Energy).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Vitality), 1));
     
     GetVital((int)VitalName.Mana).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Intelligence), 1));
     
     
     }
     
     private void SetupSkillModifiers() {
     GetSkill((int)SkillName.Melee_Offense).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Strength), .33f));
     GetSkill((int)SkillName.Melee_Offense).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Attack), .33f));
     
     GetSkill((int)SkillName.Melee_Defense).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Speed), .33f));
     GetSkill((int)SkillName.Melee_Defense).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Vitality), .33f));
     
     GetSkill((int)SkillName.Magic_Offense).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Intelligence), .33f));
     GetSkill((int)SkillName.Magic_Offense).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Magic), .33f));
     
     GetSkill((int)SkillName.Magic_Defense).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Intelligence), .33f));
     GetSkill((int)SkillName.Magic_Defense).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Magic), .33f));
     
     GetSkill((int)SkillName.Ranged_Offense).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Intelligence), .33f));
     GetSkill((int)SkillName.Ranged_Offense).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Speed), .33f));
     
     GetSkill((int)SkillName.Ranged_Defense).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Parry), .33f));
     GetSkill((int)SkillName.Ranged_Defense).AddModifier(new ModifyingAttribute(GetPrimaryAttribute((int)AttributeName.Speed), .33f));
     
     
     
     
     
     
     
     
     
     }
     
     
     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();
     }
     
     
 }