# Failing pip\_install('scikit-image') on Slicer 4.13.0-2021-09-26 due to missing python-real.exe

**URL:** <https://discourse.slicer.org/t/failing-pip-install-scikit-image-on-slicer-4-13-0-2021-09-26-due-to-missing-python-real-exe/19958>\
**Category:** Support\
**Tags:** pip\
**Created:** [October 1, 2021, 6:04pm UTC](https://discourse.slicer.org/t/failing-pip-install-scikit-image-on-slicer-4-13-0-2021-09-26-due-to-missing-python-real-exe/19958 "2021-10-01T18:04:39Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![mikebind](https://avatars.discourse-cdn.com/v4/letter/m/71e660/32.png) [@mikebind](https://discourse.slicer.org/u/mikebind)\
**Post date:** [October 1, 2021, 6:04pm UTC](https://discourse.slicer.org/t/failing-pip-install-scikit-image-on-slicer-4-13-0-2021-09-26-due-to-missing-python-real-exe/19958/1 "2021-10-01T18:04:39Z")

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This worked just fine for me previously on the stable version. This is the initial error message I get:

`error: Application does NOT exists [C:/Users/mikeb/AppData/Local/NA-MIC/Slicer 4.13.0-2021-09-26/bin/./python-real.exe]`

Followed by

```auto
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "C:\Users\mikeb\AppData\Local\NA-MIC\Slicer 4.13.0-2021-09-26\bin\Python\slicer\util.py", line 2925, in pip_install
    _executePythonModule('pip', args)
  File "C:\Users\mikeb\AppData\Local\NA-MIC\Slicer 4.13.0-2021-09-26\bin\Python\slicer\util.py", line 2900, in _executePythonModule
    logProcessOutput(proc)
  File "C:\Users\mikeb\AppData\Local\NA-MIC\Slicer 4.13.0-2021-09-26\bin\Python\slicer\util.py", line 2869, in logProcessOutput
    raise CalledProcessError(retcode, proc.args, output=proc.stdout, stderr=proc.stderr)
subprocess.CalledProcessError: Command '['C:/Users/mikeb/AppData/Local/NA-MIC/Slicer 4.13.0-2021-09-26/bin/../bin\\PythonSlicer.EXE', '-m', 'pip', 'install', 'scikit-image']' returned non-zero exit status 1.

```

There is, in fact, no python-real.exe in the referenced folder. Should there be?

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [October 1, 2021, 7:33pm UTC](https://discourse.slicer.org/t/failing-pip-install-scikit-image-on-slicer-4-13-0-2021-09-26-due-to-missing-python-real-exe/19958/2 "2021-10-01T19:33:58Z")

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`pip_install('scikit-image')` works for me on Windows with 4.13.0-2021-09-27, and python-real.exe exists on my computer here: `c:\Users\andra\AppData\Local\NA-MIC\Slicer 4.13.0-2021-09-27\bin\python-real.exe`.

The most likely culprit for a missing executable is a hyper-active antivirus software. Check your quarantined files. Not using third-party antivirus software or disabling automatic file delete/quarantine on the Slicer install folder and then reinstalling Slicer should fix the problem.

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**Author:** ![mikebind](https://avatars.discourse-cdn.com/v4/letter/m/71e660/32.png) [@mikebind](https://discourse.slicer.org/u/mikebind)\
**Post date:** [October 1, 2021, 8:32pm UTC](https://discourse.slicer.org/t/failing-pip-install-scikit-image-on-slicer-4-13-0-2021-09-26-due-to-missing-python-real-exe/19958/3 "2021-10-01T20:32:01Z")

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Thank you!! The problem was that Avast antivirus had quarantined the executable. I’m confused why it didn’t tell me about it though. I would have had a hard time figuring this out on my own.