Umable to create the object of type derived

I have a base and derived class and the base class is abstracted as it has a pure virtual function in it and this function has been implemented in derived class.

But i am not able to create the object and no error is showing up , i am using Xcode in mac and the compilation is failing and nothing is showing up.

i am not able to create an object of type derived with base pointer , also i am not able to create an object of derived class directly too

  #include <iostream>


    class myApp
    {
    public:

    void Startup()
    {
        //Template Method
        initialize();
        if(!validate())
            altInit();
    }
    virtual bool validate() const = 0;
    virtual void altInit();

    //private:
    void initialize()
    {
        std::cout << "INIT \n";
    }
    };


    class myDerApp : public myApp
    {

    public:
       virtual bool validate() const
    {
        std::cout << "myDer Validate \n";
        return 1;

    }
    virtual void altInit()
    {
        std::cout << "myDer INIT \n";

    }


    };

    int main(int argc, const char * argv[])
    {

       myApp *abc = new myDerApp();
       myDerApp obj1;

    }

Please advise.

The only error is

clang:-1: linker command failed with exit code 1 (use -v to see invocation) Regards