How To Fix No Module Named ‘numpy.core._multiarray_umath’ When Run Python Code In Annoconda Python Environment

I run an Eclipse Pydev project with an anaconda virtual python environment as the python interpreter. When I run the source code, I meet the No Module Named ‘numpy.core._multiarray_umath’ error.  This article will tell you how to fix it.

1. The No Module Named ‘numpy.core._multiarray_umath’ Error.

  1. Below is the detailed message for the error.
    C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\Lib\site-packages\numpy\ UserWarning: mkl-service package failed to import, therefore Intel(R) MKL initialization ensuring its correct out-of-the box operation under condition when Gnu OpenMP had already been loaded by Python process is not assured. Please install mkl-service package, see
      from . import _distributor_init
    Traceback (most recent call last):
      File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\Lib\site-packages\numpy\core\", line 22, in <module>
        from . import multiarray
      File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\Lib\site-packages\numpy\core\", line 12, in <module>
        from . import overrides
      File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\Lib\site-packages\numpy\core\", line 7, in <module>
        from numpy.core._multiarray_umath import (
    ModuleNotFoundError: No module named 'numpy.core._multiarray_umath'
    During handling of the above exception, another exception occurred:
    Traceback (most recent call last):
      File "D:\Work\\PythonExampleProject\com\dev2qa\example\code_learner_dot_com_example\", line 7, in <module>
        import matplotlib.pyplot as plt
      File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\Lib\site-packages\matplotlib\", line 107, in <module>
        from . import _api, cbook, docstring, rcsetup
      File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\Lib\site-packages\matplotlib\cbook\", line 28, in <module>
        import numpy as np
      File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\Lib\site-packages\numpy\", line 150, in <module>
        from . import core
      File "C:\Users\zhaosong\anaconda3\envs\MyPythonEnv\Lib\site-packages\numpy\core\", line 48, in <module>
        raise ImportError(msg)
    Importing the numpy C-extensions failed. This error can happen for
    many reasons, often due to issues with your setup or how NumPy was
    We have compiled some common reasons and troubleshooting tips at:
    Please note and check the following:
      * The Python version is: Python3.7 from "C:\Users\zhaosong\anaconda3\envs\ExampleEnv\python.exe"
      * The NumPy version is: "1.21.2"
    and make sure that they are the versions you expect.
    Please carefully study the documentation linked above for further help.
    Original error was: No module named 'numpy.core._multiarray_umath'

2. How To Fix The No Module Named ‘numpy.core._multiarray_umath’ Error.

  1. I found my current used anaconda version is 2.0, and the latest anaconda version is  2.1.
  2. So I remove the anaconda version 2.0 from my PC.
  3. And download and install the latest anaconda version.
  4. I create a new virtual python environment in the anaconda environments and install the required python libraries in the anaconda ( How To Install/Uninstall Python Packages In Anaconda Virtual Environment Successfully  ).
  5. And then apply the new anaconda virtual python environment as the Eclipse Pydev project python interpreter ( How To Change Python Interpreter In Eclipse Pydev Project To Use Different Python Virtual Environment Library ).
  6. Now when I run the example python code, the error is fixed.
  7. This is the easiest way to fix this error.


  1. How To Install Anaconda On Linux, Windows, macOS Correctly

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