500 Obteniendo un error como 500 (Error interno del servidor)

jquery-3.6.0.js:10109 POST http://localhost/Banner_module/public/index.php/delete 500 (Error interno del servidor)

Código HTML:

 <td> <button type="button" value="<?= $row['bid'];?>" class="cd btn btn-outline-danger" >Delete</button> </td>

código jquery:

 $.ajax({ type: "POST", url: "<?= site_url('delete') ?>", data: {"bid": bid} })

Rutas :

 $routes->post('delete','Home::delete');

controlador:

 public function delete(){ $user = new Bmodel(); //$bid = $this->input->post('uid',true); $bid = $this->input->post('bid'); // $data = array( // 'uid' => $this->input->post('uid') // ); // $uid= json_encode($data); $data['user'] = $user->where('bid', $bid)->delete($bid); $response = ['status'=> "Deleted", 'status_text'=>'Deleted','status_icon'=>'success']; return $this->response->setJSON($response); }