操作符“* & # 39;不能应用于' method group'和“浮动# 39;

我正在跟随BurgZergArcade教程学习如何创建一个Hack'N'Slash游戏。在此期间，我遇到了一个错误，如果有人能帮助我，我将非常感激。语言是c#。

错误:Assets/Scripts/Character Classes/ModifiedStat.cs(21,66):错误CS0019: Operator *' cannot be applied to operands of type method group' and ' float'

public class BaseStat {
    public class BaseStat {
    private int _baseValue;         //The base value of this stat
    private int _buffValue;         //The amount of buff to this stat
    private int _expToLevel;        //Thetotal amount of exp needed to raise this skill
    private float _levelModifier;   //The modifier applied to the exp needed to raise the skill
    public BaseStat() {
        _baseValue = 0;
        _buffValue = 0;
        _levelModifier = 1.1f;
        _expToLevel = 100;
    }
    public int BaseValue{
        get{ return _baseValue; }
        set{ _baseValue = value; }
    }
    public int BuffValue{
        get{ return _buffValue; }
        set{ _buffValue = value; }
    }
    public int ExpToLevel{
        get{ return _expToLevel; }
        set{ _expToLevel = value; }
    }
    public float LevelModifier{
        get{ return _levelModifier; }
        set{ _levelModifier = value; }
    }
    private int CalculateExpToLevel() {
        return (int)(_expToLevel * _levelModifier);
    }
    public void LevelUp() {
        _expToLevel = CalculateExpToLevel();
        _baseValue++;
    }
    public int AdjustedValue() {
        return _baseValue + _buffValue;
    }
}
public class Atrribute : BaseStat {
    public Atrribute() {
        ExpToLevel = 50;
        LevelModifier = 1.05f;
    }
}
public enum AttributeName{
Might,
Constitution,
Nimbleness,
Speed,
Concentration,
Willpower,
Charisma
}
public class ModifiedStat : BaseStat {
    private List<ModifyingAttribute> _mods;         //A list of Attributes that modify this stat
    private int _modValue;                          //
    public ModifiedStat(){
        _mods = new List<ModifyingAttribute>();
        _modValue = 0;
    }
    public void AddModifier( ModifyingAttribute mod ) {
        _mods.Add(mod);
    }
    private void CalculateModValue() {
        _modValue = 0;
        if(_mods.Count > 0)
            foreach( ModifyingAttribute att in _mods )
                _modValue += (int)(att.attribute.AdjustedValue * att.ratio);
    }
}
public struct ModifyingAttribute {
    public Atrribute attribute;
    public float ratio;
}

_modValue += (int)(att.attribute.AdjustedValue() * att.ratio);