Can't get split source files to work, please help.

First time using multiple source files and i'm having a bit of trouble, below is the error i'm getting from Dev C++ as well as the source code

ISO C++ forbids declaration of `Description' with no type
prototype for `int RoomOne::Description()' does not match any in class `RoomOne' void RoomOne::Description() 
`int RoomOne::Description()' and `void RoomOne::Description()' cannot be overloaded
[roomone.o] Error 1 


Header file
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#ifndef ROOMONE_H
#define ROOMONE_H

// No description
class RoomOne
{
	public:
        void Description();
};

#endif // ROOMONE_H 


The classes source code
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#include <cstdlib>
#include <iostream>
#include "roomone.h"

using namespace std;

RoomOne::Description()
{
    cout << " test test test\n\n ";
}


The main source code
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#include <cstdlib>
#include <iostream>
#include "roomone.h"
#include "roomtwo.h"

using namespace std;

//Object Prototyping
    RoomOne ob;

void startUp();
void playerCommand();
void room1();
void room2();
void room3();
void room4();
void room5();
void room6();
void room7();

//Integers
int map[9][9] =
{   {0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0},
    {0,0,0,6,0,0,0,0,0},
    {0,0,2,3,5,7,0,0,0},
    {0,0,1,0,4,0,0,0,0},
    {0,0,0,0,0,0,0,0,0},
    {0,0,0,0,0,0,0,0,0}},
    currentX = 2, currentY = 6,
    room = map[currentY][currentX],
    health = 100,
    score = 0;

//Charachters
char roomName[10] = {"The Runes"},
     north[6] = {"North"},
     command[10];

//Boolean
bool game = 1,
     validMove = 0,
     itemsHolding[20] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};


int main(int argc, char *argv[])
{
    startUp();
    //Main Game
    do
    {
        room = map[currentY][currentX];

        cout << " ------------------------------------------------------------------------------\n";
        cout << "   Score: " << score << "       Location: " << room << "       Health: " << health << "\n";
        cout << " ------------------------------------------------------------------------------\n\n";

        switch(room)
        {
            case 1:
                ob.Description();
                break;
            case 2:
                room2();
                break;
            case 3:
                room3();
                break;
            case 4:
                room4();
                break;
            case 5:
                room5();
                break;
            case 6:
                room6();
                break;
            case 7:
                room7();
                break;
            default:
                cout << "You are outside the map\n";
        }

        playerCommand();

        system("CLS");
        //game = 0;
    }
    while(game==1);

    return EXIT_SUCCESS;
}

void playerCommand()
{
    validMove = 0;

    while(validMove==0)
    {
        cout << " Enter Command: ";
        cin >> command;

        if (!stricmp(command, "North")) //Move North
        {
            currentY = currentY - 1;
            if(map[currentY][currentX]==0)
            {
                cout << "\n You can't move that way!\n\n ";
                currentY = currentY + 1;
                system("PAUSE");
            }
            else
                cout << " You moved North\n ";
                validMove = 1;
        }
        else if (!stricmp(command, "East")) //Move East
        {
            currentX = currentX + 1;
            if(map[currentY][currentX]==0)
            {
                cout << "\n You can't move that way!\n\n ";
                currentX = currentX - 1;
                system("PAUSE");
            }
            else
                cout << " You moved East\n ";
                validMove = 1;
        }
        else if (!stricmp(command, "South")) //Move South
        {
            currentY = currentY + 1;
            if(map[currentY][currentX]==0)
            {
                cout << "\n You can't move that way!\n\n ";
                currentY = currentY - 1;
                system("PAUSE");
            }
            else
                cout << " You moved South\n ";
                validMove = 1;
        }
        else if (!stricmp(command, "West")) //Move West
        {
            currentX = currentX - 1;
            if(map[currentY][currentX]==0)
            {
                cout << "\n You can't move that way!\n\n ";
                currentX = currentX + 1;
                system("PAUSE");
            }
            else
                cout << " You moved West\n ";
                validMove = 1;
        }
        else if (!stricmp(command, "Inventory")) //Inventory
        {
        }
        else if (!stricmp(command, "Look")) //Loo
        {
        }
        else if (!stricmp(command, "Pick Up")) //Pick Up
        {
        }
        else if (!stricmp(command, "Use")) //Use
        {
        }
        else if (!stricmp(command, "Help")) //Help
        {
            system("CLS");
            startUp();
            validMove = 1;
        }
        else if (!stricmp(command, "Quit")) //Quit
        {
            game = 0;
            system("CLS");
            cout << "\n Created by Aaron Walwyn. Pre-Alpha 15/05/12. Copyrighth 2012 ©.\n\n ";
            system("pause");
            validMove = 1;
        }
    }


}

void startUp()
{
    cout << "\n #     #                                #     #\n"
         << " #  #  #  ####  #####  #      #####      #   # \n"
         << " #  #  # #    # #    # #      #    #      # #  \n"
         << " #  #  # #    # #    # #      #    #       #   \n"
         << " #  #  # #    # #####  #      #    #      # #  \n"
         << " #  #  # #    # #   #  #      #    #     #   # \n"
         << "  ## ##   ####  #    # ###### #####     #     #\n\n";

    cout << " Controls: \n ---------\n"
         << " North\n"
         << " East\n"
         << " South\n"
         << " West\n\n"

         << " Inventory\n"
         << " Look\n"
         << " Pick Up\n"
         << " Use\n\n"

         << " Help\n"
         << " Quit\n\n ";

    system("PAUSE");
    system ("CLS");
}

void room1() //Room One Program
{
    cout << " You find yourself in a cell, around \n\n";
}

void room2() //Room Two Program
{
    cout << " You are in Room Two (Hallway outside Cell 01).\n\n";
}

void room3() //Room Three Program
{
    cout << " You are in Room Three ().\n\n";
}

void room4() //Room Four Program
{
    cout << " You are in Room Four ().\n\n";
}

void room5() //Room Five Program
{
    cout << " You are in Room Five ().\n\n";
}

void room6() //Room Six Program
{
    cout << " You are in Room Six ().\n\n";
}

void room7() //Room Seven Program
{
    cout << " You are in Room Seven ().\n\n";
}

/*  Inventory Items and their codes
bool item[20]

0 = Rusty Key
1 =
2 =
3 =
4 =
5 =
6 =
7 =
8 =
9 =
10 =
11 =
12 =
13 =
14 =
15 =
16 =
17 =
18 =
19 =





*/
The classes source code

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#include <cstdlib>
#include <iostream>
#include "roomone.h"

using namespace std;

RoomOne::Description()
{
    cout << " test test test\n\n ";
}


You forgot to tell the return type of the function in its definition:

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#include <cstdlib>
#include <iostream>
#include "roomone.h"

using namespace std;

void RoomOne::Description()
{
    cout << " test test test\n\n ";
}
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