issue on validate coupon code

[aimeo.alpesh]

Hello
I am getting below error on validate coupon code.

No item found for conditions: Array ( [product.code] => demo-rebate )

Please advice how can i get and fix it.

Url : http://127.0.0.1:8000/shop/basket

Body :

{
"_token": "gNZJD9NCl0Xe0oo6co58Ng7m4KrCX7DErAvr8JAC",
"b_prod": [
{
"quantity": "1",
"position": "0"
}
],
"b_coupon": "888888"
}

[aimeos]

Seems like you've removed the product with code "demo-rebate" from the product panel (or removed all demo products). This is necessary for adding the voucher to the basket.