Laravel Route [dashboard] is not defined - php

Question

Trying to play with Laravel today for the first time. I am getting the following error when I attempt to visit:
InvalidArgumentException
Route [dashboard] not defined.
routes/web.php
Route::get('/', ['as' => '/', 'uses' => 'LoginController#getLogin']);
Route::post('/login', ['as' => 'login', 'uses' => 'LoginController#postLogin']);
Route::get('/logout', ['as' => 'logout', 'uses' => 'LoginController#getLogout']);
Route::group(['middleware' => ['authenticate', 'roles']], function (){
Route::get('/dashboard', ['as' => 'dashboard', 'uses' => 'DashboardController#dashboard']);
});
LoginController.php
class LoginController extends Controller
{
use AuthenticatesUsers;
protected $username = 'username';
protected $redirectTo = '/';
protected $guard = 'web';
public function getLogin()
{
if (Auth::guard('web'))
{
return redirect()->route('dashboard');
}
return view('login');
}
public function postLogin(Request $request)
{
$auth = Auth::guard('web')->attempt([
'username' => $request->username,
'password' => $request->password,
'active' => 1]);
if ($auth)
{
return redirect()->route('dashboard');
}
return redirect()->route('/');
}
public function getLogout()
{
Auth::guard('web')->logout();
return redirect()->route('/');
}
}

Answer 1

as like name(). You should use one of the two :
Route::group(['middleware' => ['authenticate', 'roles']], function (){
Route::get('/dashboard', 'DashboardController#dashboard')->name('dashboard');
});
Or
Route::group(['middleware' => ['authenticate', 'roles']], function (){
Route::get('/dashboard', [
'as' => 'dashboard',
'uses' => 'DashboardController#dashboard']);
});
After, you clear route cache with php artisan route:clear
Final, you can use php artisan route:list to lists all routes and the action bind

Answer 2

Try this:
Route::get('/dashboard','DashboardController#dashboard')->name('dashboard');

Answer 3

When you use as it names the route , so you have add two name dashbbaorddashboard because you use as and name
Route::group(['middleware' => ['authenticate', 'roles']], function (){
Route::get('/dashboard', ['uses' => 'DashboardController#dashboard'])->name('dashboard');
});
This will work