undefined reference to `spacebar::get_cmt[abi:cxx11]()' in VS Code

Question

I am a noobie to CPP programming, i have encountered this error while trying a create a simple header, implementation and src file execution, i checked my code many times seems to be some new error and please kindly guide me through execute this in VS Code since its completely different from VS.

spacebar.hpp

#pragma once
#include <string>
//Class spacebar will hold 3 members 2 integers and 1 str, and perform some basic operations 
class spacebar{
    public:
        // constructor
        spacebar(int value1,int value2, std::string cmts){
            val1 = value1;
            val2 = value2;
            cmt = cmts;
        }
        // Getter and setter
        void set_value1(int val);
        void set_value2(int val);
        void set_cmt(std::string cmts1);
        int get_value1();
        int get_value2();
        std::string get_cmt();
        // operations
        void spacebar_op();

        // private members
    private:

        int val1,val2;
        std::string cmt;

};

spacebar.cpp

//Impelemtation file for spacebar.h
#include <iostream>
#include <string>
#include "spacebar.hpp"

void spacebar::set_value1(int val){
    val1 = val;
}
void spacebar::set_value2(int val){
    val2 = val;
}
void spacebar::set_cmt(std::string cmts1){
    cmt = cmts1;
}

int spacebar::get_value1(){
    return val1;
}

int spacebar::get_value2(){
    return val2;
}
std::string spacebar::get_cmt(){
    return cmt;
}

void spacebar::spacebar_op(){
    int temp;
    temp = val1;
    val1 = (val1-val2);
    val2 = (temp-val1);
    //cmt = cmt+" Done";

}

spacebardemo.cpp

#include <iostream>
#include "spacebar.hpp"
#include <string>

int main(){
    int val1,val2;
    std::string cmt;

    std::cout<<"In Main.cpp file ->>"<<std::endl;
    std::cout<<"This is spacebar encoder \n please enter the 3 set of values to print the key\n";
    std::cin>>val1>>val2>>cmt;


    spacebar obj(val1,val2,cmt);
    std::cout<<"\n Values \n val1 "<<obj.get_value1()<<"\n val2 "<<obj.get_value2()<<"\n cmt "<<obj.get_cmt();
    obj.spacebar_op();
    std::cout<<"\nPrivate key :";
    std::cout<<std::to_string(obj.get_value1())<<std::to_string(obj.get_value2())<<obj.get_cmt()<<std::endl;
return 0;
}

please let me know if any further info needed for better debugging. thank you in Advance!

tasks.json added

{
    "tasks": [
        {
            "type": "cppbuild",
            "label": "C/C++: g++.exe build active file",
            "command": "C:\\msys64\\mingw64\\bin\\g++.exe",
            "args": [
                "-fdiagnostics-color=always",
                "-g",
                "${file}",
                "-o",
                "${fileDirname}\\${fileBasenameNoExtension}.exe"
            ],
            "options": {
                "cwd": "${fileDirname}"
            },
            "problemMatcher": [
                "$gcc"
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            },
            "detail": "Task generated by Debugger."
        }
    ],
    "version": "2.0.0"
}