Laravel 5.8 Trying to get property 'unreadNotifications' of non-object - php

Question

Working on my friend's code, it seems all features like Post, Tag, Category, etc are working fine. I want to add a feature to upload a pdf and download it from front end. After adding DownloadController and Downloads model, It shows varies errors. Most irritating error is
Trying to get property 'unreadNotifications' of non-object(View: /var/www/html/tes/resources/views/admin/layouts/header.blade.php)
Routes:
//Admin Routes
Route::group(['namespace'=>'Admin'], function (){
Route::get('admin/home','HomeController#index')->name('admin.index');
//Users Routes
Route::resource('admin/user','UserController');
//Roles Routes
Route::resource('admin/role','RoleController');
//permissions Routes
Route::resource('admin/permission','PermissionController');
//Download Manager Routes - CV
Route::resource('admin/cv','Downloadcontroller');
//Post Routes
Route::DELETE('postDeleteSelected','PostController#deleteSelected')->name('deleteSelected');
Route::get('admin/post/remove/{post}','PostController#remove')->name('posts.remove');
Route::get('admin/post/trash','PostController#trashed')->name('posts.trashed');
Route::get('admin/post/recover/{id}','PostController#recover')->name('posts.recover');
Route::get('markAsRead','PostController#markRead')->name('markRead');
Route::resource('admin/post','PostController');
//Tag Routes
Route::resource('admin/tag','TagController');
//Category Routes
Route::resource('admin/category','CategoryController');
//Admin Auth Routes
Route::get('admin-login','Auth\LoginController#showLoginForm')->name('admin.login');
Route::post('admin-login','Auth\LoginController#login');
});
Controller:
namespace App\Http\Controllers\Admin;
use App\Model\admin\admin;
use App\Model\user\Downloads;
use App\Http\Controllers\Controller;
use App\Notifications\TaskCompleted;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Notification;
class Downloadcontroller extends Controller
{
/**
* Display a listing of the resource.
*
* #return \Illuminate\Contracts\View\Factory|\Illuminate\View\View
*/
public function index()
{
return view('admin.cv.show');
}
/**
* Show the form for creating a new resource.
*
* #return \Illuminate\Http\Response
*/
public function create()
{
//
}
/**
* Store a newly created resource in storage.
*
* #param \Illuminate\Http\Request $request
* #return \Illuminate\Http\Response
*/
public function store(Request $request)
{
$data = new Downloads;
if ($request->file('file')){
$file = $request->file('file');
$filename = time().'.'.$file->getClientOriginalExtension();
$request->file->move('storage/'.$filename);
$data->file = $filename;
}
$data->title = $request->title;
$data->description = $request->description;
$data->uploader = Auth::user()->name;
$data->save();
$users = admin::where('id','3')->get();
Notification::send($users, new TaskCompleted($data));
return redirect(route('cv.index'))->with('toast_success','Post Created Successfully');
}
View: in admin.cv.show, the template extends the admin.layouts.app. and the problematic view is here.
<li class="nav-item dropdown">
<a class="nav-link" data-toggle="dropdown" href="#">
<i class="far fa-bell"></i>
#if (Auth::check())
#if(auth()->user()->unreadNotifications->count())
<span class="badge badge-warning navbar-badge">{{auth()->user()->unreadNotifications->count()}}</span>
#endif
#endif
</a>
<div class="dropdown-menu dropdown-menu-lg dropdown-menu-right">
<span class="dropdown-item dropdown-header">
Mark All as Read
</span>
#foreach(auth()->user()->unreadNotifications as $notification)
<div class="dropdown-divider"></div>
<a href="#" class="dropdown-item" style="background-color: lightgrey">
<p><i class="fas fa-envelope mr-2"></i>{{$notification->data['data']}}
<span class="float-right text-muted text-sm">{{$notification->created_at->diffForHumans()}}</span>
</p>
</a>
#endforeach
#foreach(auth()->user()->readNotifications->take(5) as $notification)
<div class="dropdown-divider"></div>
<a href="#" class="dropdown-item">
<p><i class="fas fa-envelope mr-2"></i>{{$notification->data['data']}}
<span class="float-right text-muted text-sm">3 mins</span>
</p>
</a>
#endforeach
<div class="dropdown-divider"></div>
See All Notifications
</div>
</li>