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

嘿，当我在后面的代码中离开namespace sf{ 声明时，我得到了这个奇怪的错误:

1>c:libraries and headerssfmlsfml-1.6-sdk-windows-vc2008sfml-1.6includesfmlgraphicsbody.h(70): error C2989: 'sf::Body' : class template has already been declared as a non-class template
1>c:libraries and headerssfmlsfml-1.6-sdk-windows-vc2008sfml-1.6includesfmlgraphicsbody.h(11): error C3856: 'sf': class is not a class template

在过去的3周中，当它不是模板类时，代码工作得很好，使用相同的sf::Body类名;我只是最近改变了它，使它更灵活。我不能在命名空间内声明模板类吗?

代码如下:

#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