InversifyJS @multiInject not working, throws error "Ambiguous match found for serviceIdentifier"

I am using inversifyJs for DI in my typescript project. When using the decorator @multiInject, I am getting the error "Ambiguous match found for serviceIdentifier". I am following this example (https://github.com/inversify/InversifyJS/blob/master/wiki/multi_injection.md). Why am I getting this error? Any help will be appreciated. Thanks.

import 'reflect-metadata';
import { Container, multiInject, injectable, } from 'inversify';

interface IWeapon {
  name: string;
}

interface INinja {
  weapons: IWeapon[],
  displayWeapons(): void,
}

@injectable()
class Katana implements IWeapon {
  public name = 'Katana';
}

@injectable()
class Shuriken implements IWeapon {
  public name = 'Shuriken';
}

@injectable()
class Ninja implements INinja {
  public weapons: IWeapon[];

  constructor(
    @multiInject('Weapon') _weapons: IWeapon[],
  ) {
    this.weapons = _weapons;
  }

  public displayWeapons = () => {
    console.log(this.weapons[0].name, this.weapons[1].name);
  }
}

const container = new Container();

container.bind<INinja>("Ninja").to(Ninja);
container.bind<IWeapon>("Weapon").to(Katana);
container.bind<IWeapon>("Weapon").to(Shuriken);

const ninja = container.get<INinja>('Weapon');
ninja.displayWeapons(); // Should display all weapons.

You are getting "Ambiguous match found for serviceIdentifier" because when you get the container you are using the "weapon" identifier and that is not correct.

Changing this line const ninja = container.get<INinja>('Weapon'); to const ninja = container.get<INinja>('Ninja'); should give you the desired output.