C++ RTTI

Hi i wrote a simple c++ code but when i compiled it using Microsoft Visual C++ 6.0 IDE .i gives me Warning "dynamic_cast used on polymorphic type class D with /GR- option unpredictable behaviour my result".And when i execute it give error "Abnormal Program termination " without giving any output.I am in great trouble help me.The code I am using is follows:---


/******************************************************/
//////////             RTTI            ////////////
/******************************************************/

#include <iostream.h>
class A
{
     public :
     virtual void print(void)const{
          cout<<"I am A"<<endl;
     }


};
class B: public A
{
public :
     virtual void print(void)const{
          cout<<"I am B"<<endl;
     }


};

class C: public A
{
public:
     virtual void print(void)const{
          cout<<"I am C"<<endl;
     }

};


class D
{

 public:
          virtual void print(void) const{
          cout<<"I am D"<<endl ;
     }

};

class E:public B,C,D
{
     public:
          virtual void print(void)const{
          cout<<"I am E"<<endl ;
     }


};

void cmprint(D *d)
{
     E *pe;
     pe=dynamic_cast<E *>(d);
     pe->print();
}
void main()
{

     D *pd=new D;
     cmprint(pd);


}