WindowsError Error 126 The specified module could not be found

Question

I am loading a dll in python using following code   if os path exists dll path        my dll   ctypes cdll LoadLibrary dll path    But I am continuously getting the following error  WindowsError   Error 126  The specified module could not be found  dll is present at the specified path  but I didn t understand why I m getting the error

User · Answer

There is a promising answer at Problem updating bokeh: [WinError 126] The specified module could not be found.

It hints at https://github.com/conda/conda/issues/9313.

There, you find:

It's a library load issue. More details at github.com/conda/conda/issues/8836 You probably have a broken conda right now. You can use a standalone conda from repo.anaconda.com/pkgs/misc/conda-execs to repair it: standalone-conda.exe update -p C:\ProgramData\Anaconda3 conda-package-handling You should get version 1.6.0, and the problems should go away.

Thus, it might simply be a conda issue. Reinstalling standalone conda might repair the error. Please comment whoever can confirm this.

User · Answer

When I see things like this - it is usually because there are backslashes in the path which get converted   For example - the following will fail - because  t in the string is converted to TAB character    gt  gt  gt  import ctypes  gt  gt  gt  ctypes windll LoadLibrary  c  tools depends depends dll   Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt    File  c  tools python271 lib ctypes   init   py   line 431  in LoadLibrary     return self  dlltype name    File  c  tools python271 lib ctypes   init   py   line 353  in   init       self  handle    dlopen self  name  mode  WindowsError   Error 126  The specified module could not be found   There are 3 solutions  if that is the problem   a  Use double slashes      gt  gt  gt  import ctypes  gt  gt  gt  ctypes windll LoadLibrary  c   tools  depends  depends dll     b  use forward slashes   gt  gt  gt  import ctypes  gt  gt  gt  ctypes windll LoadLibrary  c  tools depends depends dll     c  use RAW strings  prefacing the string with r   gt  gt  gt  import ctypes  gt  gt  gt  ctypes windll LoadLibrary r c  tools depends depends dll     While this third one works - I have gotten the impression from time to time that it is not considered  correct  because RAW strings were meant for regular expressions  I have been using it for paths on Windows in Python for years without problem

User · Answer

NestedCaveats solution worked for me  Imported my  dll files before importing torch and gpytorch  and all went smoothly  So I just want to add that its not just importing pytorch but I can confirm that torch and gpytorch have this issue as well  I d assume it covers any other torch-related libraries

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Tried to specify dll path in different ways  proposed by  markm   but nothing has worked for me  Fixed the problem by copying dll into script folder  It s not a good solution  but ok for my purposes

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I met the same problem in Win10 32bit OS  I resolved the problem by changing the DLL from debug to release version   I think it is because the debug version DLL depends on other DLL  and the release version did not

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On the off chance anyone else ever runs into this extremely specific issue   Something inside PyTorch breaks DLL loading  Once you run import torch  any further DLL loads will fail  So if you re using PyTorch and loading your own DLLs you ll have to rearrange your code to import all DLLs first  Confirmed w  PyTorch 1 5 0 on Python 3 7

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Note that even if the DLL is in your path  If that DLL relies on other DLLs that are NOT in your path  you can get the same error  Windows could not find a dependency in this case  Windows is not real good at telling you what it could not find  only that it did not find something  It is up to you to figure that out  The Windows dll search path can be found here  http   msdn microsoft com en-us library 7d83bc18 aspx  In my case  being sure all needed dlls were in the same directory and doing a os chdir   to that directory solved the problem

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problem solved for me  I changed version from pytorch 1 5 1 to pytorch 1 4 and typed the below command in anaconda prompt window conda install pytorch  1 4 0 torchvision  0 5 0 -c pytorch

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Also this could be that you have forgotten to set your working directory in eclipse to be the correct local for the application to run in

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for me install Microsoft Visual C   2015 Redistributable Update 3 from https   www microsoft com en-us download details aspx id 53587 solved it

User · Answer

In Windows  it s possible  You will need to install  Visual C   Redistributable for Visual Studio 2015  I had the same problem and I installed both version  Windows x86 and Windows x64   Apparently both are necessary to make it work

User · Answer

If you are using GCC to compile it for Windows  it s possible that the error is because dependent libraries can t be found   Using the -static flag if linking with GCC might fix that

User · Answer

if you come across this error when you try running PyTorch related libraries you may have to consider installing PyTorch with CPU only version i e  if you don t have Nvidia GPU in your system  Pytorch with CUDA worked in Nvidia installed systems but not in others

[python] WindowsError: [Error 126] The specified module could not be found

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