Getting 404 not found on adding NEW ROUTES - php

Question

Everything was working fine before I installed a package https://github.com/kreait/firebase-php.
Now I get 404 error on adding new Routes.
Old Routes are working fine, but new routes are not working
Web.php
//old routes
Route::get('/', function () {
return view('welcome'); //working
});
Route::get('email', 'EmailController#sendEmail'); /working
Route::get('/counter',function() {
$counter = Redis::incr('counter'); //working
return $counter;
});
//new routes
//Firebase admin SDK
Route::get("fire","FirebaseSdkController#fire");
Route::get("say-hello", function(){
return "hello";
});
FirebaseSdkController.php
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use Kreait\Firebase;
use Kreait\Firebase\Messaging\CloudMessage;
class FirebaseSdkController extends Controller
{
public function fire()
{
$firebase = (new Firebase\Factory())->create();
$messaging = $firebase->getMessaging();
$topic = 'News';
$message = CloudMessage::withTarget('topic', $topic)
->withNotification("Hello") // optional
// ->withData($data) // optional
;
$message = CloudMessage::fromArray([
'topic' => $topic,
'notification' => [/* Notification data as array */], // optional
'data' => [/* data array */], // optional
]);
$messaging->send($message);
}
}
This is what I have tried so far -
php artisan route:list
shows the new routes in the list
php artisan route:clear
php artisan config:clear
composer dump-autoload
None of them solved the issue.
Update
Now, if I delete any route and do php artisan route:clear, I still can access the route. I don't know what's happening please help.