Erro ao chamar método index

Está dando erro ao rodar o site, dizendo que o index não existe. Meu código:

<?php

namespace App\Http\Controllers;
use Illuminate\Http\Request;

class SeriesController extends Controller
{
    public function index() {
        $series = [
            'Grey\'s Anatomy',
            'Lost',
            'Agents of SHIELD'
        ];

        return view ('series.index', [
            'series' => $series
        ]);

    }

}

O erro:

Method App\Http\Controllers\SeriesController::index does not exist.
http://127.0.0.1:8000/series
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Database name
seems incorrect

You're using the default database name laravel. This database does not exist.

Edit the .env file and use the correct database name in the DB_DATABASE key.