# slicer cannot find path separator

**URL:** <https://discourse.slicer.org/t/slicer-cannot-find-path-separator/24466>\
**Category:** Support\
**Tags:** extensions-manager, python\
**Created:** [July 24, 2022, 3:52pm UTC](https://discourse.slicer.org/t/slicer-cannot-find-path-separator/24466 "2022-07-24T15:52:41Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Xin\_Chen](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/xin_chen/32/8683_2.png) [@Xin\_Chen](https://discourse.slicer.org/u/Xin_Chen)\
**Post date:** [July 24, 2022, 3:52pm UTC](https://discourse.slicer.org/t/slicer-cannot-find-path-separator/24466/1 "2022-07-24T15:52:41Z")

</div>

Hello everyone  
I used Slicer 5.1.0 (Preview Release) on Win 10 (64 bit).  
Now, I want to open the extension Module from github. I succefully add the path of Module in Edit tab. However, when I execute the module, Slicer told me that :

```auto
ERROR: Could not open requirements file: [Errno 2] No such file or directory: 'D:EEG_ToolBoxSemiology-Visualisation-Tool-masterrequirements.txt'
Traceback (most recent call last):
  File "D:/EEG_ToolBox/Semiology-Visualisation-Tool-master/slicer/SemiologyVisualisation.py", line 1423, in installRepository
    import mega_analysis
  File "D:\EEG_ToolBox\Semiology-Visualisation-Tool-master\mega_analysis\ __init__.py", line 2, in <module>
    from .crosstab.gif_lobes_from_excel_sheets import gif_lobes_from_excel_sheets
  File "D:\EEG_ToolBox\Semiology-Visualisation-Tool-master\mega_analysis\crosstab\gif_lobes_from_excel_sheets.py", line 1, in <module>
    import pandas as pd
ModuleNotFoundError: No module named 'pandas'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:/EEG_ToolBox/Semiology-Visualisation-Tool-master/slicer/SemiologyVisualisation.py", line 99, in setup
    self.logic.installRepository()
  File "D:/EEG_ToolBox/Semiology-Visualisation-Tool-master/slicer/SemiologyVisualisation.py", line 1429, in installRepository
    slicer.util.pip_install(
  File "E:\Program Files\slicer-PreRelease\Slicer 5.1.0-2022-07-22\bin\Python\slicer\util.py", line 3535, in pip_install
    _executePythonModule('pip', args)
  File "E:\Program Files\slicer-PreRelease\Slicer 5.1.0-2022-07-22\bin\Python\slicer\util.py", line 3498, in _executePythonModule
    logProcessOutput(proc)
  File "E:\Program Files\slicer-PreRelease\Slicer 5.1.0-2022-07-22\bin\Python\slicer\util.py", line 3467, in logProcessOutput
    raise CalledProcessError(retcode, proc.args, output=proc.stdout, stderr=proc.stderr)
subprocess.CalledProcessError: Command '['E:/Program Files/slicer-PreRelease/Slicer 5.1.0-2022-07-22/bin/../bin\\PythonSlicer.EXE', '-m', 'pip', 'install', '-r', 'D:EEG_ToolBoxSemiology-Visualisation-Tool-masterrequirements.txt']' returned non-zero exit status 1.

```

I know, the module need load ‘D:\EEG\_ToolBox\Semiology-Visualisation-Tool-master\requirements.txt’, and this file existed in this path indeed.  
I don’t know why Slicer can’t recognize the path separator ('')?  
Could any one help me?

---

<div class="post-metadata">

**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:** [July 24, 2022, 3:56pm UTC](https://discourse.slicer.org/t/slicer-cannot-find-path-separator/24466/2 "2022-07-24T15:56:42Z")

</div>

It seems that the path was not specified correctly. See how to specify native Windows paths [here](https://slicer.readthedocs.io/en/latest/developer_guide/python_faq.html#how-to-type-file-paths-in-python).