How to fix item declaration problem

//Item init here:
Item copperLongsword("Longsword", "Copper", 
"A longblade made of dull copper", 1, Weapon, 1, 0, 1, 1, 1, false);

enum ItemType { 
    Weapon,
    Shield,
    Consumable,
    Necklance,
    Ring,
    Robe,
    Shirt,
    Pants,
    Helmet,
    Chestplate,
    Pauldron,
    Gauntlet,
    Greaves,
    Boots,
};

class Item
{
    private: 
            std::string Name;
            std::string material;
            int dataBaseID;
            int itemVal;
            std::string itemDesc;
            int maxItemCharges;
            ItemType type;
            int weaponDmg;
            int healBase;
            int armorRating;
            int enchantVal;
            int stack;
            int maxStack;
            bool stackable;

    public:
        Item();
        Item(std::string Name, std::string material,
             std::string ItemDesc, int DatabaseID, int ItemType, 
             int Attack, int Defense, int GoldValue, int Stack, 
             int MaxStack, bool Stackable);
        std::string GetItem() {return Name;}
        std::string GetItemDesc() {return itemDesc;}
        int GetDatabaseID() {return dataBaseID;}
        int GetItemType() {return type;}
        int GetDmg() {return weaponDmg;}
        int GetArmorRating() {return armorRating;}
        int GetItemVal() {return itemVal;}
        int GetStack() {return stack;}
        int GetMaxStack() {return maxStack;}
        bool GetStackable() {return stackable;}
};

std::vector<Item> inventory;

Functions.h:8:1: error: ‘Item’ does not name a type; did you mean ‘tm’?
    8 | Item copperLongsword("Longsword", "Copper", 
    "A longblade made of dull copper", 1, Weapon, 1, 0, 1, 1, 1, false);
      | ^~~~
      | tm
Functions.h: In member function ‘void Character::levelUp()’:
Functions.h:266:33: error: ‘copperLongsword’ was not declared in this scope
  266 |             inventory.push_back(copperLongsword);
      |                                 ^~~~~~~~~~~~~~~
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