ImportError DLL load failed 1 is not a valid Win32 application But the DLL s are there

Question

I have a situation very much like the one at ImportError  DLL load failed   1 is not a valid Win32 application  but the answer there isn t working for me   My Python code says   import cv2   But that line throws the error shown in the title of this question   I have OpenCV installed in C  lib opencv on this 64-bit machine  I m using 64-bit Python   My PYTHONPATH variable  PYTHONPATH C  lib opencv build python 2 7  This folder contains cv2 pyd and that s all   My PATH variable  Path  OPENCV DIR  bin     This folder contains 39 DLL files such as opencv core246d dll   OPENCV DIR has this value  OPENCV DIR C  lib opencv build x64 vc11   The solution at ImportError  DLL load failed   1 is not a valid Win32 application says to add  the new opencv binaries path  C  opencv build bin Release  to the Windows PATH environment variable   But as shown above  I already have the OpenCV binaries folder  C  lib opencv build x64 vc11 bin  in my PATH  And my OpenCV installation doesn t have any Release folders  except for an empty one under build java    Any ideas as to what s going wrong  Can I tell Python to verbosely trace the loading process  Exactly what DLL s is it looking for   Thanks  Lars  EDIT   I just noticed that  according to http   www dependencywalker com   the cv2 pyd in C  lib opencv build python 2 7 is 32-bit  whereas the machine and the Python I m running are 64-bit  Could that be the problem  And if so  where can I find a 64-bit version of cv2 pyd

User · Answer

I experienced the same problem while trying to write a code concerning Speech_to_Text.

The solution was very simple. Uninstall the previous pywin32 using the pip method

pip uninstall pywin32

The above will remove the existing one which is by default for 32 bit computers. And install it again using

pip install pywin32

This will install the one for the 64 bit computer which you are using.

User · Answer

For me the problem was that I was using different versions of Python in the same Eclipse project  My setup was not consistent with the Project Properties and the Run Configuration Python versions   In Project   Properties   PyDev  I had the Interpreter set to Python2 7 11   In Run Configurations   Interpreter  I was using the Default Interpreter  Changing it to Python 2 7 11 fixed the problem

User · Answer

I found the solution  maybe you can try to use the cmd window rather than the anaconda prompt window to start you first scrapy test

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If your build-system  CMake in my case  copies the file from  lt name gt  dll to  lt name gt  pyd  you will get this error if the original file wasn t actually a dll   In my case  building shared libraries got switched off  so the underlying file was actually a   lib   I discovered this error by loading the pyd file in DependencyWalker and finding that it wasn t valid

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I just had this problem  it turns it was just because I was using x64 version of the opencv file   Tried the x86 and it worked

User · Answer

I got this error when trying to import MySQLdb    What worked for me was to uninstall Python and then reinstall it    I got the error after installing npm  https   www npmjs com get-npm   One thing it did was install Python even though I already had it

User · Answer

Please make sure that you have installed python 2 7 12 or below version otherwise you will get this error definitely  Make sure Oracle client is 64 bit installed if OS is 64 Bit  Make sure Microsoft Visual C   Compiler for Python 2 7 is 64 for bit for 64 bit Os or 32 bit for 32 bit  Note - IF ur OS is 64 bit install all package of 64 bit or if Os is 32 bit install 32 bit package

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First I copied cv2 pyd from  opencv build python 2 7 x86 to C  Python27 Lib site-packeges  The error was       RuntimeError  module compiled against API version 9 but this version of numpy is 7    Then I installed numpy-1 8 0-win32-superpack-python2 7 exe and opencv works fine    gt  gt  gt  import cv2  gt  gt  gt  print cv2   version   2 4 13

User · Answer

You can install opencv from official or unofficial sites   Refer to this question and this issue if you are using Anaconda

User · Answer

In my case  I have 64bit python  and it was lxml that was the wrong version--I should have been using the x64 version of that as well  I solved this by downloading the 64-bit version of lxml here   https   pypi python org pypi lxml 3 4 1  lxml-3 4 1 win-amd64-py2 7 exe   This was the simplest answer to a frustrating issue

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Wow  I found yet another case for this problem  None of the above worked  Eventually I used python s ability to introspect what was being loaded  For python 2 7 this means   import imp imp find module  cv2     This turned up a completely unexpected  cv2 pyd  file in an Anaconda DLL directory that wasn t touched by multiple uninstall install attempts  Python was looking there first and not finding my good installation  I deleted that cv2 pyd file and tried imp find module  cv2   again and python immediately found the right file and cv2 started working   So if none of the other solutions work for you  make sure you use python introspection to see what file python is trying to load

User · Answer

I had the same problem  Here s what I did    I downloaded pywin32 Wheel file from here  then I uninstalled the pywin32 module  To uninstall execute the following command in Command Prompt   pip uninstall pywin32 Then  I reinstalled pywin32  To install it  open the Command Prompt in the same directory where the pywin32 wheel file lies  Then execute the following command   pip install  lt Name of the wheel file with extension gt  Wheel file will be like  piwin32-XXX-cpXX-none-win32 whl   It solvs the problem for me  You may also like to give it a try  Hope it work for you as well

User · Answer

So I had problems installing vtk under windows  as I use python 3 7 there is no binary available so far just for older python versions pip install vtk is not working   I did wrote python in my cmd   Python 3 7 3 on win32  So I now know I have python 3 7 3 runing on a 32 bit   I then downloaded the correct wheel at VTK-8 2 0-cp37-cp37m-win32 whl  Next I instlled that wheel   pip install VTK-8 2 0-cp37-cp37m-win32 whl   Then I tested it and it worked   python import vtk

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Unofficial Windows Binaries for Python Extension Packages  you can find any python libs from here

User · Answer

This has worked for me  I have tried different methods but this was my best solution   Open command prompt and type the following  pip install opencv-python    make sure your internet is on   after that try importing it again

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It could also be that your anaconda version is 32 bit when it should be 64 bit

User · Answer

Please check if the python version you are using is also 64 bit  If not then that could be the issue  You would be using a 32 bit python version and would have installed a 64 bit binaries for the OPENCV library

User · Answer

It has a very simple solution  After installing opencv place  cv2 pyd from C  opencv build python 2 7    x64   to C  Python27 Lib site-packages  instead of  place cv2 pyd from C  opencv build python 2 7    x86   to C  Python27 Lib site-packages

User · Answer

Update numpy   pip install numpy --upgrade  Work for me

User · Answer

This one worked with me pip install -- pywin32  227

User · Answer

I faced the same issue when I uninstalled and reinstalled a different version of 2 7 x of Python on my system using a 32 bit Windows Installer  I got the same error on most of my import statements  I uninstalled the newly installed Python and downloaded a 64 bit Windows installer and reinstalled Python again and it worked  Hope this helps you

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I copied cv2 pyd file from  opencv build python 2 7 x86 folder instead of from  x64 folder to C  Python27 Lib site-packeges  I followed rest of the instructions provided here   Added by someone else  not verified  I also copy file cv2 pyd to folder C  Python27 Lib site-packages cv2  It works

[python] ImportError: DLL load failed: %1 is not a valid Win32 application. But the DLL's are there

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