Can't add data via postman - postman

Question

I want to make crud in postman with codeigniter4. But I have a problem when I will add data with post function an error occurs in postman like the picture I sent.
This is a picture of the Error section
controller Konven.php
class Konven extends BaseController
{
/**
* Get all Konven
* #return Response
*/
public function index()
{
$model = new KonvenModel();
return $this->getResponse(
[
'message' => 'Product Convent retrieved',
'produk_konven' => $model->findAll()
]
);
}
/**
* Create a new KOnven
*/
public function store()
{
$rules = [
'nama_menu' => 'required',
'tipe_id' => 'required'
];
$input = $this->getRequestInput($this->request);
if (!$this->validateRequest($input, $rules)) {
return $this->getResponse(
$this->validator->getErrors(),
ResponseInterface::HTTP_BAD_REQUEST
);
}
$konvenEmail = $input['nama_menu'];
$model = new KonvenModel();
$model->save($input);
$produk_konven = $model->where('nama_menu', $konvenEmail)->first();
return $this->getResponse(
[
'message' => 'Product Convent added successfully',
'produk_konven' => $produk_konven
]
);
}
/**
* Get a single client by ID
*/
public function show($produk_konven_id)
{
try {
$model = new KonvenModel();
$produk_konven = $model->findKonvenById($produk_konven_id);
return $this->getResponse(
[
'message' => 'Product Convent retrieved successfully',
'produk_konven' => $produk_konven
]
);
} catch (Exception $e) {
return $this->getResponse(
[
'message' => 'Could not find product convent for specified ID'
],
ResponseInterface::HTTP_NOT_FOUND
);
}
}
model KonvenModel.php
class KonvenModel extends Model
{
protected $table = 'produk_konven';
protected $allowedFields = [
'nama_menu',
'status',
'tipe_id'
];
protected $updatedField = 'updated_at';
public function findKonvenById($produk_konven_id)
{
$produk_konven = $this
->asArray()
->where(['produk_konven_id' => $produk_konven_id])
->first();
$produk_konven->join('tipe', 'produk_konven.tipe_id = tipe.tipe_id');
$produk_konven->orderBy("produk_konven_id", "asc");
if (!$produk_konven) throw new Exception('Could not find client for specified ID');
return $produk_konven;
}
}
Can friends help me overcome the obstacles that I am experiencing?