download nltk data in aws lambda from python code – Amazon Web Sevices

I am trying to dowloand nltk data in AWS lambda from python code. But It says

{
  "errorMessage": "[Errno 30] Read-only file system: 'layers'",
  "errorType": "OSError",
  "requestId": "",
  "stackTrace": [
    "  File "/var/lang/lib/python3.9/importlib/__init__.py", line 127, in import_modulen    return _bootstrap._gcd_import(name[level:], package, level)n",
    "  File "<frozen importlib._bootstrap>", line 1030, in _gcd_importn",
    "  File "<frozen importlib._bootstrap>", line 1007, in _find_and_loadn",
    "  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlockedn",
    "  File "<frozen importlib._bootstrap>", line 680, in _load_unlockedn",
    "  File "<frozen importlib._bootstrap_external>", line 850, in exec_modulen",
    "  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removedn",
    "  File "/opt/python/lib/python3.9/site-packages/datadog_lambda/handler.py", line 30, in <module>n    handler_module = import_module(modified_mod_name)n",
    "  File "/var/lang/lib/python3.9/importlib/__init__.py", line 127, in import_modulen    return _bootstrap._gcd_import(name[level:], package, level)n",
    "  File "<frozen importlib._bootstrap>", line 1030, in _gcd_importn",
    "  File "<frozen importlib._bootstrap>", line 1007, in _find_and_loadn",
    "  File "<frozen importlib._bootstrap>", line 972, in _find_and_load_unlockedn",
    "  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removedn",
    "  File "<frozen importlib._bootstrap>", line 1030, in _gcd_importn",
    "  File "<frozen importlib._bootstrap>", line 1007, in _find_and_loadn",
    "  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlockedn",
    "  File "<frozen importlib._bootstrap>", line 680, in _load_unlockedn",
    "  File "<frozen importlib._bootstrap_external>", line 850, in exec_modulen",
    "  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removedn",
    "  File "/var/task/entrypoints/__init__.py", line 14, in <module>n    from utils.container import state_machinen",
    "  File "/var/task/utils/container.py", line 10, in <module>n    from service_layer.models.nltk_downloader import is_nltk_data_downloadn",
    "  File "/var/task/service_layer/models/nltk_downloader.py", line 12, in <module>n    nltk.download("punkt", download_dir=environ["LAMBDA_NLTK_DATA"])n",
    "  File "/var/task/nltk/downloader.py", line 777, in downloadn    for msg in self.incr_download(info_or_id, download_dir, force):n",
    "  File "/var/task/nltk/downloader.py", line 642, in incr_downloadn    yield from self._download_package(info, download_dir, force)n",
    "  File "/var/task/nltk/downloader.py", line 699, in _download_packagen    os.makedirs(download_dir)n",
    "  File "/var/lang/lib/python3.9/os.py", line 215, in makedirsn    makedirs(head, exist_ok=exist_ok)n",
    "  File "/var/lang/lib/python3.9/os.py", line 225, in makedirsn    mkdir(name, mode)n"
  ]
}

Here is my code

        nltk.download("punkt", download_dir=download_dir)
        nltk.download("wordnet", download_dir=download_dir)
        nltk.download("omw-1.4", download_dir=download_dir)

I tried with a different download_dir option. But Nothing worked. For example,

download_dir = /layers/nltk_data
download_dir = nltk_data
etc

Any idea?