Error: no match for 'operator-' (operand types are 'Space' and 'int')

#include <iostream>
#include <SFML/Graphics.hpp>
#include <cmath>
 
using namespace sf;
 
class Object{
private:
    float pX, pY, sX, sY, m;
 
public:
    Object(){
 
    };
    Object(float px, float py, float sx, float sy, float M) : pX{px}, pY{py}, sX{sx}, sY{sy}, m{M} {
 
    };
    void interaction(Object object, double time){
        sX += time * object.m / pow(abs(pX - object.pX), 2);
        sY += time * object.m / pow(abs(pY - object.pY), 2);
    }
    void update(double time){
        pX += time * sX;
        pY += time * sY;
    }
    void set(float px, float py, float sx, float sy, float M){
        pX = px; pY = py; sX = sx; sY = sy; m = M;
    }
 
};
 
class Space{
private:
    Object *objects; Object *buf; int countObject, bufCount = 0;
 
public:
    Space(){
 
    };
    Space(int argCount){
        if(countObject > 0){
            buf = new Object[bufCount];
            for(int i = 0; i < bufCount; i++)
                buf[i] = objects[i];
            delete[] objects;
        }
        objects = new Object[countObject];
        for(int i = 0; i < bufCount; i++)
            objects[i] = buf[i];
        delete[] buf;
 
    };
    void addObject(float px, float py, float sx, float sy, float M){
        bufCount = countObject;
        countObject++;
        Space(countObject);
        objects[countObject-1].set(px, py, sx, sy, M);
    }
 
};
 
 
int main()
{
    RenderWindow window(VideoMode(800, 600), "Simulation");
 
    while(window.isOpen()){
        Event event;
        while(window.pollEvent(event)) if(event.type == Event::Closed) window.close();
 
 
 
 
 
    }
    return 0;
}

class Space
{
    std::vector<Object> container;
public:
    Space() {}
    Space(int argCount) :container(argCount) {}
    void addObject(float px, float py, float sx, float sy, float M)
    {
        container.emplace_back(px, py, sx, sy, M);
    }
};