Syntax error: missing ';' before '*' with Item class

I’m encountering these errors:

1>...inventory.h(9): error C2143: syntax error: missing ';' before '*'
1>...inventory.h(9): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>...inventory.h(9): error C2238: unexpected token(s) preceding ';'
1>...inventory.h(15): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>...inventory.h(15): error C2143: syntax error: missing ',' before '&'

When trying to compile the following code.

Inventory.h

#pragma once
#include "Includes.h"

class Inventory
{
private:
    int inv_cap;
    int inv_nrOfItems;
    Item **inv_itemArr;
    void expand();
    void initialize(const int from);
public:
    Inventory();
    virtual ~Inventory();
    void addItem(const Item &inv_item);
    void removeItem(int index);

};

Includes.h

#pragma once
#include <iostream>
#include <iomanip>
#include <string>
#include <ctime>
#include "Functions.h"
#include "Character.h"
#include "Item.h"
#include "Inventory.h"

using namespace std;

Item.h

#pragma once
#include "Includes.h"

class Item
{
private:
    std::string i_name;
    int i_buyValue;
    int i_sellValue;


public:
    Item();
    virtual ~Item();

    inline void debugPrint() const
    {
        std::cout << i_name << std::endl;
    }


};

Based on the googling I’ve done, my problems seems to have to do with forward declaration, but I’m in the dark as how to fix it.