Papermill ValueError("No language found in notebook and no override provided.")

[filippoteodoro]

I am trying to use Papermill on this notebook https://github.com/filippoteodoro/rep/blob/master/Prices%20Predictions/Price_Prediction_Multivariate_Prophet.ipynb

By executing this command:
(base) filippoteodoro@Filippos-MacBook-Pro ~ % papermill /Users/filippoteodoro/Price_Prediction_Multivariate_Prophet.ipynb s3://filippoteodoro/Price_Prediction_Multivariate_Prophet.ipynb -p x 10

I am setting x as a placeholder parameter even though I don't need it just because I if I don't I get:
ValueError: Required parameter key not set

And I get this error. I don't understand what It means by "No language found in notebook and no override provided."

(base) filippoteodoro@Filippos-MacBook-Pro ~ % papermill /Users/filippoteodoro/Price_Prediction_Multivariate_Prophet.ipynb s3://filippoteodoro/Price_Prediction_Multivariate_Prophet.ipynb -p x 10 
Input Notebook:  /Users/filippoteodoro/Price_Prediction_Multivariate_Prophet.ipynb
Output Notebook: s3://filippoteodoro/Price_Prediction_Multivariate_Prophet.ipynb
Traceback (most recent call last):
  File "/Users/filippoteodoro/opt/miniconda3/bin/papermill", line 8, in <module>
    sys.exit(papermill())
  File "/Users/filippoteodoro/opt/miniconda3/lib/python3.8/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/Users/filippoteodoro/opt/miniconda3/lib/python3.8/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/Users/filippoteodoro/opt/miniconda3/lib/python3.8/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/filippoteodoro/opt/miniconda3/lib/python3.8/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/Users/filippoteodoro/opt/miniconda3/lib/python3.8/site-packages/click/decorators.py", line 21, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/Users/filippoteodoro/opt/miniconda3/lib/python3.8/site-packages/papermill/cli.py", line 250, in papermill
    execute_notebook(
  File "/Users/filippoteodoro/opt/miniconda3/lib/python3.8/site-packages/papermill/execute.py", line 94, in execute_notebook
    nb = parameterize_notebook(
  File "/Users/filippoteodoro/opt/miniconda3/lib/python3.8/site-packages/papermill/parameterize.py", line 80, in parameterize_notebook
    language = nb_language(nb, language)
  File "/Users/filippoteodoro/opt/miniconda3/lib/python3.8/site-packages/papermill/utils.py", line 82, in nb_language
    raise ValueError("No language found in notebook and no override provided.")
ValueError: No language found in notebook and no override provided.

[MSeal]

So colab generated notebooks are sometimes not specifying a language anywhere in the metadata of the notebook. This means papermill doesn't know what language to translate the -p x 10 argument into. To get around this you can pass the --language python (or -l python) argument to tell papermill that it is in-fact a python notebook. I'll add a ping to the colab issue around the missing metadata.

[filippoteodoro]

Thank you so much!