二进制表达式的操作数无效

我正在尝试实现使用继承/多态性的类，但我不明白为什么会出现这个错误：

二进制表达式错误的无效操作数（'basic_ostream<char，std:：_1:：char_traits>'和'void'）

错误在下面称为animate的函数中，它被两个**包围，就在main的正上方。由于某种原因，c->move给出了此错误，但c->name没有。我已经实现了其他一切，其他一切似乎都正常工作。这只是一个错误。有人能解释一下发生了什么事吗？基本上，这里的基类是生物，所有其他类都是从中派生的

#include <iostream>
#include <string>
using namespace std;

class Creature {
public:
    Creature(string new_name) {
        its_name=new_name;
    }
    virtual void move() const=0;
    virtual bool isMortal() const =0;
    string name() const {
        return its_name;
    }
    virtual ~Creature();
    
private:
    string its_name;
    
};
class Phoenix:public Creature {
public:
    Phoenix(string new_name):Creature(new_name) {};
    virtual void move() const{
        cout<<"Squawkes, who is immortal, will now fly.";
    }
    virtual bool isMortal() const {
        return false;
    }
    
    virtual ~Phoenix();
};
class Giant:public Creature {
public:  
    Giant(string new_name,int new_lbs): Creature(new_name) {
        lbs=new_lbs;
        
    }
    virtual void move() const {
        if (lbs<20) {
            cout<<"Frawp, who is mortal, will now tromp.";
        }
        else {
            cout<<"Gridwulfa, who is mortal, will now lumber.";
        }
    }
    virtual bool isMortal() const {
        return true;
    }
    
    virtual ~Giant();
private:
    int lbs;
};
class Centaur:public Creature {
public:
    Centaur(string new_name):Creature(new_name) {};
    virtual void move() const{
        cout<<"Squawkes, who is immortal, will now fly.";
    }
    virtual bool isMortal() const {
        return false;
    }
    
    virtual~Centaur();
};
void animate(const Creature* c)  //need to add & or is * sufficient?
{
    cout << c->name() << ", who is ";
    if (c->isMortal())
        cout << "mortal";
    else
        cout << "immortal";
    **cout << ", will now " << c->move() << ".n";**
}
Here is my main:
int main() {
    
    Creature* creatures[4];
    creatures[0] = new Phoenix("Squawkes");
    // Giants have a name and a weight in tons.  Giants under 20 tons
    // walk by tromping; giants weighing at least 20 tons lumber.
    creatures[1] = new Giant("Frawp", 17);
    creatures[2] = new Giant("Gridwulfa", 22);
    creatures[3] = new Centaur("Florence");
    
    cout << "Here are the creatures." << endl;
    for (int k = 0; k < 4; k++)
        animate(creatures[k]);
    
    // Clean up the creatures before exiting
    cout << "Cleaning up." << endl;
    for (int k = 0; k < 4; k++)
        delete creatures[k];

}

我不应该改变主体或动画。我必须正确地实现所有的类