Unrecognized error in boost library

Question

I got this code from a book (Boost C++ Application Development Cookbook) and I tried running it, it compiled with g++ but when I try running it, it gives me this error "terminate called after throwing an instance of 'boost::exception_detail::clone_impl >' what(): unknown option ranges Aborted (core dumped)" It didn't compile with clang, I compiled with "g++ ex1.cxx -lboost_program_options" and "clang ex1.cxx -lboost_program_options"

#include <boost/program_options.hpp>
#include <boost/program_options/errors.hpp>
#include <iostream>

namespace opt = boost::program_options;

int main(int argc, char* argv[]){
    opt::options_description desc("All options");
    // 'a' and 'o' are short option names for apples
    desc.add_options()("apple,a", opt::value<int>()->default_value(10),
        "apples that you have")
        ("oranges,o", opt::value<int>(), "oranges that you have")("name",
        opt::value<std::string>(), "your name")("help", "produce help message");
    opt::variables_map vm;
    opt::store(opt::parse_command_line(argc, argv, desc), vm);
    opt::notify(vm);
    if(vm.count("help")){
        std::cout << desc << "\n";
        return 1;
    }
    try{
        opt::store(opt::parse_config_file<char>("apples_oranges.cfg", desc), vm);
    }
    catch(const opt::reading_file& e){
        std::cout << "Failed to open 'apples_oranges.cfg': " << e.what();
    }
    opt::notify(vm);
    if(vm.count("name")){
        std::cout << "Hi, "<< vm["name"].as<std::string>() << "!\n";
    }
    std::cout << "Fruits count: "
        << vm["apples"].as<int>() + vm["oranges"].as<int>() << std::endl;
    return 0;
}

Answer 1

There is a typo here

vm["apples"].as<int>();

should be

vm["apple"].as<int>();

See it Live On Coliru

#include <boost/program_options.hpp>
#include <boost/program_options/errors.hpp>
#include <iostream>

namespace opt = boost::program_options;

int main(int argc, char* argv[]){
    opt::options_description desc("All options");
    // 'a' and 'o' are short option names for apples
    desc.add_options()
        ("apple,a",   opt ::value<int>()->default_value(10), "apples that you have")
        ("oranges,o", opt ::value<int>(),                    "oranges that you have")
        ("name",      opt ::value<std::string>(),            "your name")
        ("help", "produce help message");

    opt::variables_map vm;
    opt::store(opt::parse_command_line(argc, argv, desc), vm);

    opt::notify(vm);
    if(vm.count("help")){
        std::cout << desc << "\n";
        return 1;
    }
    try{
        opt::store(opt::parse_config_file<char>("apples_oranges.cfg", desc), vm);
    }
    catch(const opt::reading_file& e){
        std::cout << "Failed to open 'apples_oranges.cfg': " << e.what();
    }
    opt::notify(vm);
    if(vm.count("name")){
        std::cout << "Hi, "<< vm["name"].as<std::string>() << "!\n";
    }
    int a_ = vm["apple"].as<int>();
    int o_ = vm["oranges"].as<int>();
    std::cout << "Fruits count: " << a_ + o_ << std::endl;
}