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I have updated qiskit module but unfortunately, it doesn't work it says

C:\Users\Aman\AppData\Local\Programs\Python\Python36-32
\lib\site-packages\marshmallow\schema.py:364: 
ChangedInMarshmallow3Warning: strict=False is not recommended. 

In marshmallow 3.0, schemas will always be strict. See 
https://marshmallow.readthedocs.io/en/latest/upgrading.html
#schemas-are-always-strict ChangedInMarshmallow3Warning

What shall I do?

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This is a Just a Python warning about deprecated usage. It will be fixed in the next release. It should not prevent you from upgrading Qiskit or writing any code today.

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    $\begingroup$ I used 'pip install -U qiskit' then everything goes wrong. And I can't run my code!!!! $\endgroup$ – Aman Feb 11 at 9:06
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    $\begingroup$ Can you you post your code or any other errors you're seeing? $\endgroup$ – Leron Gil Feb 11 at 17:18
  • $\begingroup$ I found it. it is just the plot_histogram function doesn't work. When I change it to the print it works fine!! Thank You!! $\endgroup$ – Aman Feb 18 at 14:42

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