laravel 5.6 invoice manager - Call to a member function count() on string

i'm building a invoice manager app in laravel 5.6. i'm tryiing to follow the following tut:https://www.youtube.com/watch?v=h6sTdAX6yTs&list=PLVAw_4sB6qJwCloLkV1SudLR0wcgiEXay&index=2 however i get stuck with on the part where i need to display invoices in the index (8:00).

Error: Call to a member function count() on string

index.blade.php:

@extends('layouts.app')

@section('content')

<div>
    <div>
        <div>
            <span>Invoices</span>
            <a href="">Create</a>
        </div>
    </div>
    <div>
        @if(($invoices->count()))
            <table>
                <thead>
                    <th>invoice no.</th>
                    <th>Grand Total</th>
                    <th>Client</th>
                    <th>Invoice Date</th>
                    <th>Due Date</th>
                    <th colspan="2">Created At</th>
                </thead>
                <tbody>
                    @foreach($invoices as $invoice)
                    <tr>
                        <td></td>
                        <td></td>
                        <td></td>
                        <td></td>
                        <td></td>
                        <td></td>
                    </tr>
                    @endforeach
            </table>
        @else
            <div>
                <p>
                    No Invoices were created.
                    <a href="">Create now!</a>
                </p>
            </div>
        @endif
    </div>
</div>
@endsection

InvoiceController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests;
use App\InvoiceProduct;
use App\Invoice;
use DB;

class InvoiceController extends Controller
{
    public function index(){
        $title = 'Welkom';
        //return view('pages.index', compact('title'));
        $invoices = DB::select('SELECT * FROM invoices');
        return view('invoices.index')->with('invoices', $title);
    }
}

via Chebli Mohamed