为什么我使用虚拟机会出错？

Question

我尝试使用我的几个例子创建一些多态类，我尽可能地遵循它们并且不得不解决它，不太确定为什么这不是编译。

#include<string>
#include<iostream>
#include<vector>
#include<memory>
#include<ctime>
using namespace std;

class Vehicle {
public:
    string colour;
    int wheels;
    //deconstructor
    virtual ~Vehicle(){}
    virtual void setColour(string col) {}
    virtual string getColour() { return colour; }
    virtual int getWheels() { return wheels; }
    virtual void setWheels(int numWheels){};
    Vehicle(int numWheels, string col) : wheels(numWheels), colour(col){}
};

class Auto : public Vehicle{
public:
    Auto(int numWheels, string col) : Vehicle(numWheels, col){}
    void setWheels(int numWheels){ wheels = numWheels; }
    void setColour(string col){ colour = col; }
    int getWheels();
    string getColour();
};

class Bike : public Vehicle{
private:
    string sCol;
    int iWheel;
public:
    Bike(int numWheels, string col) : Vehicle(numWheels, col){}
    void setWheels(int numWheels){ wheels = numWheels; }
    void setColour(string col){ colour = col; }
    int getWheels();
    string getColour();
};


int main(){
    Auto car1(4, "white");
    cout << car1.getColour() << endl;
    Bike bike1(2, "grey");
    cout << bike1.getColour() << endl;
}

我得到了一个奇怪的错误，我有一个大约12个小时的期末考试，我不知道为什么这个C ++代码不会编译。