Use runtime error

[jackfong123]

class Person
{
public:
     // constructor
    Person(const std::string& name)
        : m_name(name)
    {}
 
    // accessors for private members
    std::string name() const { return m_name; }
    void setName(const std::string& name) { m_name = name; }
 
    // public members
    float height;
    unsigned int shoeSize;
 
    // member function
    bool hasBigFeet() const { return shoeSize > 10; } // U.K.!
 
private:
    std::string m_name;
};
PONDER_TYPE(Person)     // declare the type to Ponder
 
static void declare()   // declare the class members to Ponder
{
    ponder::Class::declare<Person>("Person")
        .constructor<std::string>()
        .property("name", &Person::name, &Person::setName)
        .property("height", &Person::height)
        .property("shoeSize", &Person::shoeSize)
        .function("hasBigFeet", &Person::hasBigFeet)
        ;
}
int main(){
    declare();
    const ponder::Class& metaclass = ponder::classByType<Person>();
    ponder::UserObject data = ponder::runtime::create(metaclass, "Tom");
    //auto value = data.get("m_value");
    //std::cout << value << std::endl;   
    //data.set("m_value", 1000);
    return 0;
}

I compiled the demo code but got the following error:
undefined reference to `ponder::runtime::ObjectFactory::construct(ponder::Args const&, void*) const'

[fish-king]

niuwaniuwa

[lamweilun]

I am getting the same issue, anyone has any updates on this?