# Problem with debugging on Windows

**URL:** https://discourse.slicer.org/t/problem-with-debugging-on-windows/33528
**Category:** Development
**Created:** [December 27, 2023, 7:30am UTC](https://discourse.slicer.org/t/problem-with-debugging-on-windows/33528 "2023-12-27T07:30:14Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![nnzzll](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/nnzzll/32/16350_2.png) [@nnzzll](https://discourse.slicer.org/u/nnzzll)
#### Post date: [December 27, 2023, 7:30am UTC](https://discourse.slicer.org/t/problem-with-debugging-on-windows/33528/1 "2023-12-27T07:30:14Z")

</div>

I followed the debug instructions [here](https://slicer.readthedocs.io/en/latest/developer_guide/debugging/windowscpp.html#debugging-using-visual-studio) and trying to debug my C++ extensions. However, I can never start it.

It says cannot find python36.dll, but I’m using Slicer5.6.0 of which python version is 3.9, so there is no python36.dll.

Remaining error messages are shown below:

> Exception thrown at 0x00007FFF1CC524F6 (ntdll.dll) in SlicerApp-real.exe: 0xC0000139: Entry Point Not Found.  
> Exception thrown at 0x00007FFF1CC524F6 (ntdll.dll) in SlicerApp-real.exe: 0xC0000139: Entry Point Not Found.  
> The thread 1280 has exited with code 3221225785 (0xc0000139).  
> The thread 13340 has exited with code 3221225785 (0xc0000139).  
> The thread 30636 has exited with code 3221225785 (0xc0000139).  
> The program ‘[31248] SlicerApp-real.exe’ has exited with code 3221225785 (0xc0000139) ‘Entry Point Not Found’.

![屏幕截图 2023-12-27 152719](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/1/c/1c43603310f2c7e9dd37576c000abaec78cf0aff.png)  
Cannot find python36.dll

![屏幕截图 2023-12-27 152742](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/4/f/4fe606e07f9ba967ee5bd98b8e1bd346e614ff18.png)  
Cannot find Entry Point.

![屏幕截图 2023-12-27 152809](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/4/7/47e3149552e1789e8437c6661348addf9b0f36eb.png)  
Cannot find Entry Point.

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<div class="post-metadata">

### Author: ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)
#### Post date: [January 2, 2024, 10:45am UTC](https://discourse.slicer.org/t/problem-with-debugging-on-windows/33528/2 "2024-01-02T10:45:17Z")

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I don’t understand any of the Chinese error messages, but they remind me of errors I get when the environment is not properly set up. Please try following the instructions again, double and triple checking that you do not miss any step.