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I intalled quantlib using "pip install QuantLib" and now I'm getting the below error. I'm using windows 10 and Spyder IDE. I don't see any dll file called _QuantLib, only _QuantLib.cp37-win_amd64.pyd.

File "C:\Conda\lib\site-packages\QuantLib\QuantLib.py", line 13, in from . import _QuantLib

ImportError: DLL load failed: The specified module could not be found.

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  • $\begingroup$ Can you try pip freeze to see which version you have? I recommend uninstalling, and making sure you don't have QuantLib-Python installed as well, then reinstall $\endgroup$
    – StackG
    Nov 14, 2020 at 4:28
  • $\begingroup$ Yes, I had both installed QuantLib-Python 1.18 and QuantLib 1.2. I uninstalled QuantLib-Python but i'm still getting the same error. $\endgroup$
    – pkto09
    Nov 14, 2020 at 18:11
  • $\begingroup$ Which version/versions of python do you have installed, maybe they are clashing? Can you try 'which python' and 'which python3' (or Windows equivalent) to see what is running? Or I guess your IDE will have a box somewhere that tells you which python interpretor it is using? $\endgroup$
    – StackG
    Nov 17, 2020 at 23:53
  • $\begingroup$ I ran dependency walker and it determined I was missing vcruntime140_1.dll so I copied it from another folder into windows/system32 and it works now. $\endgroup$
    – pkto09
    Dec 19, 2020 at 16:39

2 Answers 2

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This seems to be an issue with QuantLib 1.2. Downgrading to 1.19 solved it for me.

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Check your version of the MSVC redistributable, that error usually occurs when the QuantLib binaries load and can't find the right version of MSVC runtime

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