error in Create a fulfillment

[gdgsrls]

Hello, I am trying to create a fulfillment, but I receive this error. I write the example of the entered information as json

{"fulfillment":
{"message":"The package was shipped this morning.",
"notify_customer":false,
"tracking_info":
{"number":1562678,
"url":"https://www.my-shipping-company.com",
"company":"my-shipping-company"},
"line_items_by_fulfillment_order":
[
{"fulfillment_order_id":8236987941170,
"fulfillment_order_line_items":
[
{
"id": 1058737493,
"quantity": 1
}
]
}
]
}
}

Received error:

{"errors":"Not Found"}