C++ Unresolved External Symbol and Unresolved Externals

Question

I am trying to create a simple array program. While I was testing member function Size() I am getting LNK2019 and LNK1120 error.

arr.h

#pragma once

namespace PV
{
    template <typename T, int S>
    class Array
    {
    public:
        int Size();
    private:
        T array[S] = { 0 };
    };
}

arr.cpp

#include "arr.h"

template<typename T, int S>
inline int PV::Array<T, S>::Size()
{
    return S;
}

driver.cpp

#include<iostream>
#include"arr.h"

int main()
{
    PV::Array<int, 5> arr;

    std::cout << arr.Size();
}

ERROR =

Severity    Code    Description Project File    Line    Suppression State
Error   LNK2019 unresolved external symbol "public: int __thiscall PV::Array<int,5>::Size(void)" (?Size@?$Array@H$04@PV@@QAEHXZ) referenced in function _main   PV_TemplateLibrary  C:\Users\Fireworks\Documents\PV_TemplateLibrary\driver.obj  1

Severity    Code    Description Project File    Line    Suppression State
Error   LNK1120 1 unresolved externals  PV_TemplateLibrary  C:\Users\Fireworks\Documents\PV_TemplateLibrary\Debug\PV_TemplateLibrary.exe

1

I am using Visual Studio 2022.