Generate searchable PDFs with Azure Form Recognizer

Unable to retrieve continuation token: cannot pickle '_io.BufferedReader' object

An error occurred: (InternalServerError) An unexpected error occurred.
Code: InternalServerError
Message: An unexpected error occurred.
Exception Details:	(FailedToSerializeAnalyzeResult) Failed to serialize analyze results, please contact support.
	Code: FailedToSerializeAnalyzeResult
	Message: Failed to serialize analyze results, please contact support

Detailed error log is:

File /Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/langchain_community/document_loaders/doc_intelligence.py:82, in AzureAIDocumentIntelligenceLoader.load(self)
     80 def load(self) -> List[Document]:
     81     """Load given path as pages."""
---> 82     return list(self.lazy_load())

File /Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/langchain_community/document_loaders/doc_intelligence.py:90, in AzureAIDocumentIntelligenceLoader.lazy_load(self)
     88 if self.file_path is not None:
     89     blob = Blob.from_path(self.file_path)
---> 90     yield from self.parser.parse(blob)
     91 else:
     92     yield from self.parser.parse_url(self.url_path)

File /Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/langchain_community/document_loaders/base.py:111, in BaseBlobParser.parse(self, blob)
     96 def parse(self, blob: Blob) -> List[Document]:
     97     """Eagerly parse the blob into a document or documents.
     98 
     99     This is a convenience method for interactive development environment.
   (...)
    109         List of documents
    110     """
--> 111     return list(self.lazy_parse(blob))

File /Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/langchain_community/document_loaders/parsers/doc_intelligence.py:97, in AzureAIDocumentIntelligenceParser.lazy_parse(self, blob)
     90 with blob.as_bytes_io() as file_obj:
     91     poller = self.client.begin_analyze_document(
     92         self.api_model,
     93         file_obj,
     94         content_type="application/octet-stream",
     95         output_content_format="markdown" if self.mode == "markdown" else "text",
     96     )
---> 97     result = poller.result()
     99     if self.mode in ["single", "markdown"]:
    100         yield from self._generate_docs_single(result)

File /Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/azure/core/polling/_poller.py:251, in LROPoller.result(self, timeout)
    242 def result(self, timeout: Optional[float] = None) -> PollingReturnType_co:
    243     """Return the result of the long running operation, or
    244     the result available after the specified timeout.
    245 
   (...)
    249     :raises ~azure.core.exceptions.HttpResponseError: Server problem with the query.
    250     """
--> 251     self.wait(timeout)
    252     return self._polling_method.resource()

File /Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/azure/core/tracing/decorator.py:78, in distributed_trace.<locals>.decorator.<locals>.wrapper_use_tracer(*args, **kwargs)
     76 span_impl_type = settings.tracing_implementation()
     77 if span_impl_type is None:
---> 78     return func(*args, **kwargs)
     80 # Merge span is parameter is set, but only if no explicit parent are passed
     81 if merge_span and not passed_in_parent:

File /Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/azure/core/polling/_poller.py:270, in LROPoller.wait(self, timeout)
    266 self._thread.join(timeout=timeout)
    267 try:
    268     # Let's handle possible None in forgiveness here
    269     # https://github.com/python/mypy/issues/8165
--> 270     raise self._exception  # type: ignore
    271 except TypeError:  # Was None
    272     pass

File /Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/azure/core/polling/_poller.py:185, in LROPoller._start(self)
    181 """Start the long running operation.
    182 On completion, runs any callbacks.
    183 """
    184 try:
--> 185     self._polling_method.run()
    186 except AzureError as error:
    187     if not error.continuation_token:

File /Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/azure/core/polling/base_polling.py:772, in LROBasePolling.run(self)
    765     raise HttpResponseError(
    766         response=self._pipeline_response.http_response,
    767         message=str(err),
    768         error=err,
    769     ) from err
    771 except OperationFailed as err:
--> 772     raise HttpResponseError(response=self._pipeline_response.http_response, error=err) from err

How can I be helpful to fix this? Thanks