STL error - with declaration move to other .h file, please help.

[vgrigor3]

In .cpp file I write:

#include "file.h"
#include <map>; 
using namespace std; 

class CPartHolder; 

typedef map<int,CPartHolder*> type_MapPartHolder; 
type_MapPartHolder mapPartHolder; 

class CPartHolder 
{ 
};

works fine
but if I move or add
declarations:

file.h :

#include <map>; 
using namespace std;

into .h file
appeared STL error
"operator new not defined for...."

What is the reason of this and gow to resolve
such a problem?

Thanks