使用API​​在akeneo api中添加产品的问题

I need help in creating products in akeneo product api usi api call. when i add product in that api It always give error "This value should not be blank." I have changed all the parameters given in the documentation but with no result

parameters {
    "identifier": "AT-TN-136-B-NCAL",
    "enabled": true,
    "family": "camcorders",
    "categories": [
        "master"
    ],
    "groups": [],
    "parent": null,
    "values": {},
    "associations": {}
}

result
{
    "code": 422,
    "message": "Validation failed.",
    "errors": [
        {
            "property": "identifier",
            "message": "This value should not be blank."
        }
    ]
}