BitBucket Restful API创建标签问题

Question

我正在尝试将正文数据为

张贴到https://bitbucket.glb.mydomain.com/rest/api/1.0/projects/FIN/repos/it-finance/tags

{
"name": "my-tag",
"startPoint": "2",
"message": "This is my tag"
}

我得到的答复是

{
"errors": [
    {
        "context": null,
        "message": "'2' is an invalid tag point.",
        "exceptionName": "com.atlassian.bitbucket.NoSuchObjectException"
    }
]
}

有什么想法吗？