Phalcon\Mvc\Micro\Exception: Not-Found handler is not callable or is not defined

<?php
 
use Phalcon\Mvc\Micro;
use Phalcon\Http\Request;
use Phalcon\Http\Response;
use Phalcon\Db\Adapter\Pdo\Sqlite;
use Phalcon\Debug;
 
const PATH = __DIR__;
//phpinfo();die();
// Debug
$debug = new Debug(true);
$debug->listen();
 
 
$app = new Micro();
$request = new Request();
 
 
$connection = new Sqlite(
    [
        'dbname' => PATH . '/database.sqlite'
    ]
);
 
$app->get(
    '/',
    function () use ($connection) {
        $response = new Response();
 
        $data = [
            'code'    => 200,
            'status'  => 'success',
            'message' => 'OK'
        ];
 
        $response->setJsonContent($data);
 
        return $response;
    }
);
 
$app->get(
    '/api/robots',
    function () {
        echo 'd';
        // Operation to fetch all the robots
    }
);
 
 
$app->post(
    '/api/tradingview',
    function () use ($connection, $request) {
//        die('d');
//        die($request->getRawBody());
        $connection->insert(
            'alert',
            [
                $connection->getDefaultIdValue(),
//                json_encode($request->getAcceptableContent()),
                $request->getRawBody(),
//                json_encode(array_merge($_POST, $_GET, $request->getHeaders(), $request->getAcceptableContent(), $request->getRawBody())),
//                json_encode($request->getPost()),
                (new \DateTime())->format('Y-m-d H:i:s'),
            ],
            [
                'id',
                'data',
                'date',
            ],
        );
    }
);
 
$app->handle($request->getURI());