我正在使用Python中的Form Recognizer（版本3.2.1）。我试图在Azure存储容器中使用pdf训练自定义模型，代码和错误如下：

document_model_admin_client = DocumentModelAdministrationClient(endpoint, credential)

poller = await document_model_admin_client.begin_build_document_model(
    ModelBuildMode.TEMPLATE, blob_container_url="[PATH TO AZURE STORAGE CONTAINER]"
)
model = await poller.result()

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`
在开始_build_document_model（）下面获取此错误：

HttpResponseError: (InvalidRequest) Invalid request.
Code: InvalidRequest
Message: Invalid request.
Inner error: {
    "code": "TrainingContentMissing",
    "message": "Training data is missing: Could not find any training data at the given path."
}

型
有什么线索能解释这一切吗？已授予存储帐户权限。