Consistent 500 error, no status text, from files_download_zip_to_file

Hitting this stack consistently.  I am using the Root namespace and this is attempting to download a personal folder as part of download a tree of personal and team folders.

File "C:\Users\PDS\git\dropzip\src\dropzip\dropzip.py", line 176, in download_folder
    dbx.files_download_zip_to_file(target, folder)
  File "C:\Users\PDS\AppData\Local\pypoetry\Cache\virtualenvs\dropzip-ocl8TPfY-py3.11\Lib\site-packages\dropbox\base.py", line 1525, in files_download_zip_to_file
    r = self.request(
        ^^^^^^^^^^^^^
  File "C:\Users\PDS\AppData\Local\pypoetry\Cache\virtualenvs\dropzip-ocl8TPfY-py3.11\Lib\site-packages\dropbox\dropbox_client.py", line 326, in request
    res = self.request_json_string_with_retry(host,
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\PDS\AppData\Local\pypoetry\Cache\virtualenvs\dropzip-ocl8TPfY-py3.11\Lib\site-packages\dropbox\dropbox_client.py", line 476, in request_json_string_with_retry
    return self.request_json_string(host,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\PDS\AppData\Local\pypoetry\Cache\virtualenvs\dropzip-ocl8TPfY-py3.11\Lib\site-packages\dropbox\dropbox_client.py", line 595, in request_json_string
    self.raise_dropbox_error_for_resp(r)
  File "C:\Users\PDS\AppData\Local\pypoetry\Cache\virtualenvs\dropzip-ocl8TPfY-py3.11\Lib\site-packages\dropbox\dropbox_client.py", line 620, in raise_dropbox_error_for_resp
    raise InternalServerError(request_id, res.status_code, res.text)
dropbox.exceptions.InternalServerError: InternalServerError('8cb6778eb30e4e658477df2c9c58a7cc', 500, '')

Anyone able to shed any light?  Sadly no useful text in the error, just an empty string!