overloading istream operator >> with getline gives error - c++

Question

I really don't know why, but I'm struggling with my >> operator getting it to work properly with getline.
Basically, I have a command class in which I want to assign the user input to its chain attribute and after that I want to split user input with space as delimiter to its string array param
For now, I just want to get the first one to work correctly, for the split, I'll do it later with strok.
Edit:
My error:
Commande.cpp: In function 'std::istream& operator>>(std::istream&, Commande&)':
Commande.cpp:82:39: error: no matching function for call to 'std::basic_istream<char>::getline(std::__cxx11::string&, int)'
stream.getline(commande.chaine, 256);
Command.cpp
Command::Command() {
}
Command::Command(std::string _chain) {
chaine = _chain;
}
Command::Command(const Command& orig) {
}
Command::~Command() {
}
std::istream& operator >> (std::istream &stream, Command& command)
{
stream.getline(command.chain, 256);
return stream;
}
Command.h
#ifndef COMMAND_H
#define COMMAND_H
#include <iostream>
#include <assert.h>
#include <fstream>
#include <string.h>
#include <stdio.h>
#include "Command.h"
public:
std::string chain;
std::string param[10];
Command();
Command(std::string _chain);
Command(const Command& orig);
virtual ~Command();
private:
friend std::istream& operator >> (std::istream&, Command&);
};
#endif /* COMMAND_H */
Main.cpp
include "command.h"
int main(int argc, char** argv) {
Command command;
std::cin >> command;
}

Answer 1

I changed my fonction as #Thomas Mattews recommanded and it works perfectly. thumbs up for all the other answers too.
std::istream& operator >> (std::istream &stream, Command& command)
{
std::getline(stream, command.chain);
return stream;
}