drupal commerce – Can not add to the basket can not set up shop

I'm trying to allow users to add the product to the cart using drupal commerce. I have a template file page__product.html.twig

I wanted to pragmatically add the cart button.

$ order_item_storage =  Drupal :: service (& # 39; entity_type.manager & # 39;) -> getStorage (& # 39; commerce_order_item & # 39;);
$ order_item = $ order_item_storage-> createFromPurchasableEntity ( Drupal  commerce_product  Entity  ProductVariation :: load ($ product-> getVariationIds ()[0]));
$ form_state_additions = [
  'product' => $product,
  'view_mode' => 'default',
  'settings' => [
  'combine' => TRUE,
],
];

$ vars['display_price'] = format_number ($ order_item-> getUnitPrice () -> getNumber (), 2). & # 39; & # 39; $ order_item-> getUnitPrice () -> getCurrencyCode ();

$ vars['form'] =  Drupal :: service (& # 39; entity.form_builder & # 39;) -> getForm ($ order_item, & # 39; add_to_cart & # 39 ;, $ form_state_additions);

However, when I click on the button it reloads the page with this error

    The website encountered an unexpected error. Please try again later.

Exception: The given entity is not assigned to any store. in Drupal  commerce_cart  Form  AddToCartForm- & gt; selectStore () (line 258 of modules / contrib / commerce / modules / cart / src / Form / AddToCartForm.php).

I'm using a custom import script

I tried to edit a product, edit its variations and select a store. However, in my opinion, the field that is stored in the editing page only allows me to select NODE e.g articles. I have a default store & # 39; Online & # 39 ;, the autocomplete, however, I only select nodes instead of stores. Any idea why?

$ product =  Drupal  commerce_product  Entity  Product :: create ([
          'uid'   => 1,
          'type'  => 'standard_commerce_product',
          'title' => $p['name'],
& # 39; field_product_category & # 39; => array (& # 39; target_id & # 39; => $ cat_id),
& # 39; body & # 39; => array (& # 39; value & # 39; => $ p['description'], & # 39; format & # 39; => & # 39; full_html & # 39;),
& # 39; field_summ & # 39; => array (& # 39; value & # 39; => $ p['description'], & # 39; format & # 39; => & # 39; full_html & # 39;),
& # 39; field_additional_details & # 39; => array (& # 39; value & # 39; => $ p['specs'], & # 39; format & # 39; => & # 39; full_html & # 39;),
& # 39; field_product_image & # 39; => $ p_img,
& # 39; field_header_logo & # 39; => array (& # 39; target_id & # 39; => 2201),
& # 39; field_reviews & # 39; => array (& # 39; target_id & # 39; => $ agraph-> id (), & # 39; target_revision_id & # 39; => $ agraph-> getRevisionId ()),

]);

$ price = new  Drupal  commerce_price  Price ((string) $ p['price'], & # 39; GBP & # 39;);

$ variation =  Drupal  commerce_product  Entity  ProductVariation :: create ([
          'title' => $p['name'],
& # 39; type & # 39; => & # 39; default & # 39 ;, // The default variation type is & # 39; default & # 39 ;.
& # 39; sku & # 39; => $ p['sku'], // The sku variation.
& # 39; status & # 39; => 1, // The status of the product. 0 for the disabled, 1 for the disabled.
& # 39; price & # 39; => $ price,
"field_stores" => array (
"target_id" => 2
) // this line does not work. leave the field blank
]);