Struggling with Class Inheritance.

[emperorguam]

I am having some serious issues with class inheritance. I am trying to make a MoneyBag class inherit from a class called bag. This will not work. I get an error complaining: error: expected class-name before '{' token. And yes I have googleing it and tried several of the various solutions offered with no avail.

The MoneyBag is pretty simple right now as I wanted to get it connected to bag before I tried to do anything with it.

//MoneyBag.h//

#ifndef MONEYBAG_H
#define MONEYBAG_H

#include <bag.h>


class MoneyBag : public bag{ ////<<------ Error appears on this line.

public:
MoneyBag();
virtual ~MoneyBag();
protected:
private:
};

#endif // MONEYBAG_H

The bag class header file that is the parent
//bag.h//

#ifndef MAIN_SAVITCH_BAG1_H
#define MAIN_SAVITCH_BAG1_H
#include <cstdlib> // Provides size_t
#include <iostream>
#include <ostream>

using namespace std;

namespace main_savitch_3
{
class bag
{
public:
// TYPEDEFS and MEMBER CONSTANTS
typedef int value_type;
typedef std::size_t size_type;
static const size_type CAPACITY = 30;
// CONSTRUCTOR
bag( ) { used = 0; }
// MODIFICATION MEMBER FUNCTIONS
size_type erase(const value_type& target);
bool erase_one(const value_type& target);
void insert(const value_type& entry);
void operator +=(const bag& addend);
// CONSTANT MEMBER FUNCTIONS
size_type size( ) const { return used; }
size_type count(const value_type& target) const;

value_type getItem(size_type i) const;
friend ostream& operator<<(ostream& out, const bag& aBag);

private:
value_type data[CAPACITY]; // The array to store items
size_type used; // How much of array is used
};

// NONMEMBER FUNCTIONS for the bag class
bag operator +(const bag& b1, const bag& b2);

}

So based on everything I have seen on line the statement:
class MoneyBag : public bag{ is legal.
As it is done this way on this very site's tutorial:
class Rectangle: public Shape, public PaintCost{

If someone could explain to me specifically what I am in particular doing wrong.
I am even willing for this to be a 'you're an idiot error' as I have wasted a lot of time on this one seemingly minor problem.

[Yanson]

class bag is in a namespace try this
class MoneyBag : public main_savitch_3::bag

[EDIT]
also please put your code in codetags its hard to read as is.

[emperorguam]

Yanson thank you for the help. That fixed it.

Sorry about the formatting issue. The above was my inaugural post. I'm such a noob at the forum and at C++.