AttributeError: 'tuple' object has no attribute 'page_content' when running a `load_summarize_chain` on an my Document generated from PyPDF Loader

[Vishruth-N]

Code:

loader_book = PyPDFLoader("D:/PaperPal/langchain-tutorials/data/The Attention Merchants_ The Epic Scramble to Get Inside Our Heads ( PDFDrive ) (1).pdf")
test = loader_book.load()
chain = load_summarize_chain(llm, chain_type="map_reduce", verbose=True)
chain.run(test[0])

I get the following error even when the test[0] is a Document object

> Entering new MapReduceDocumentsChain chain...
Output exceeds the [size limit](command:workbench.action.openSettings?%5B%22notebook.output.textLineLimit%22%5D). Open the full output data [in a text editor](command:workbench.action.openLargeOutput?6f60f6d3-3206-4586-b2b2-d8a0f86e1aa0)---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
[d:\PaperPal\langchain-tutorials\chains\Chain](file:///D:/PaperPal/langchain-tutorials/chains/Chain) Types.ipynb Cell 19 in ()
----> [1](vscode-notebook-cell:/d%3A/PaperPal/langchain-tutorials/chains/Chain%20Types.ipynb#X16sZmlsZQ%3D%3D?line=0) chain.run(test[0])

File [c:\Users\mail2\anaconda3\lib\site-packages\langchain\chains\base.py:213](file:///C:/Users/mail2/anaconda3/lib/site-packages/langchain/chains/base.py:213), in Chain.run(self, *args, **kwargs)
    211     if len(args) != 1:
    212         raise ValueError("`run` supports only one positional argument.")
--> 213     return self(args[0])[self.output_keys[0]]
    215 if kwargs and not args:
    216     return self(kwargs)[self.output_keys[0]]

File [c:\Users\mail2\anaconda3\lib\site-packages\langchain\chains\base.py:116](file:///C:/Users/mail2/anaconda3/lib/site-packages/langchain/chains/base.py:116), in Chain.__call__(self, inputs, return_only_outputs)
    114 except (KeyboardInterrupt, Exception) as e:
    115     self.callback_manager.on_chain_error(e, verbose=self.verbose)
--> 116     raise e
    117 self.callback_manager.on_chain_end(outputs, verbose=self.verbose)
    118 return self.prep_outputs(inputs, outputs, return_only_outputs)

File [c:\Users\mail2\anaconda3\lib\site-packages\langchain\chains\base.py:113](file:///C:/Users/mail2/anaconda3/lib/site-packages/langchain/chains/base.py:113), in Chain.__call__(self, inputs, return_only_outputs)
    107 self.callback_manager.on_chain_start(
    108     {"name": self.__class__.__name__},
    109     inputs,
    110     verbose=self.verbose,
    111 )
...
--> 141         [{**{self.document_variable_name: d.page_content}, **kwargs} for d in docs]
    142     )
    143     return self._process_results(results, docs, token_max, **kwargs)

AttributeError: 'tuple' object has no attribute 'page_content'

[gkamradt]

Try running .run([test[0]).

Sometimes .run looks for a list of docs since you're using a chain