'ConfigurationBuilder' does not contain a definition for 'AddJsonFile'

I have the following error:

Program.cs(15,72): error CS1061: 'ConfigurationBuilder' does not contain a definition for 'AddJsonFile' and no accessible extension method 'AddJsonFile' accepting a first argument of type 'ConfigurationBuilder' could be found (are you missing a using directive or an assembly

The project is a dotnet core app, console application, using Azure Search SDK

The line of error is below:

using System;
using System.Linq;
using System.Threading;
using Microsoft.Azure.Search;
using Microsoft.Azure.Search.Models;
using Microsoft.Extensions.Configuration;
using Microsoft.Spatial;


namespace DemoSearchIndexer
{
class Program
{
static void Main(string[] args)
{
IConfigurationBuilder builder = new ConfigurationBuilder().AddJsonFile("appsettings.json");
IConfigurationRoot configuration = builder.Build();