"class template has already been declared as a non-class template" - c++

Question

Hey i'm getting this odd error when I leave the namespace sf{ declaration in the later code:
1>c:\libraries and headers\sfml\sfml-1.6-sdk-windows-vc2008\sfml-1.6\include\sfml\graphics\body.h(70): error C2989: 'sf::Body' : class template has already been declared as a non-class template
1>c:\libraries and headers\sfml\sfml-1.6-sdk-windows-vc2008\sfml-1.6\include\sfml\graphics\body.h(11): error C3856: 'sf': class is not a class template
The code worked fine when it wasn't a template class for the past 3 weeks, With the same sf::Body class name; i just recently changed it to make it more flexible. Can i not declare a template class inside a namespace or what?
Here's the code:
#include <SFML/Graphics.hpp>
#include <vector>
#include <math.h>
#include <cmath>
namespace sf{ //when i take this out and the closing bracket the code runs fine
template<typename drawable>
class Body : public sf::Drawable{
private:
sf::Vector2f MoveVal;
std::vector<drawable> Drawables;
public:
Body(const Vector2f& Position = Vector2f(0, 0), const Vector2f& Scale = Vector2f(1, 1), float Rotation = 0.f, const Color& Col = Color(255, 255, 255, 255)){
SetPosition(Position);
SetScale(Scale);
SetRotation(Rotation);
SetColor(Col);};
// Overide Drawable Functions To Detect any Movement
void SetX(float X){
MoveVal.x += X - GetPosition().x;
Drawable::SetX(X);};
void SetY(float Y){
MoveVal.y += Y - GetPosition().y;
Drawable::SetY(Y);};
// Regular Functions
void AddObject(drawable& Object){
Object.Move(GetX(),GetY());
Drawables.push_back(Object);};
void DestroyObject(unsigned short Index){
Drawables.erase(Drawables.begin()+Index);};
void Clear(){
Drawables.clear();};
drawable& GetObject(unsigned short index)
{return Drawables[index];};
unsigned int GetNumbObjects()
{return Drawables.size();};
void Draw(sf::RenderTarget& target){
for(unsigned short I=0; I<Drawables.size(); I++){
//Body offset
Drawables[I].SetPosition(
Drawables[I].GetPosition().x + MoveVal.x,
Drawables[I].GetPosition().y + MoveVal.y);
} // TODO: add tint based on overall Body Color
target.Draw(*this);
//Reset all the Change Values
MoveVal.x=0;
MoveVal.y=0;
};
void Render(sf::RenderTarget& target) const{
for(int I=0; I< Drawables.size(); I++)
Drawables[I].Draw(target);
};
};// Body Class
} //namespace sf

Answer 1

Ok found the problem:
In a previously included header file: Shape.hpp I declare Body as a friend with the following syntax:
friend class Body;
Which apparently makes the compiler assume Body is not a template (no template indication is made)
The correct syntax was:
template <typename drawable>
friend class Body;
Because now the compiler understands Body as a template class

Answer 2

The two most likely candidates based on your information are that Graphics.hpp has mismatched { } or that you had a forward declaration of class Body without marking it a template.

Answer 3

sf::Body is a name that seems to be already taken (for a class whereas you're declaring a template). Are you sure you want to put your code in the sf namespace? It's more customary to use one's own namespaces rather than those of the libraries they use.