# Failed build on Windows

**URL:** <https://discourse.slicer.org/t/failed-build-on-windows/1228>\
**Category:** Support\
**Tags:** build\
**Created:** [October 14, 2017, 10:56pm UTC](https://discourse.slicer.org/t/failed-build-on-windows/1228 "2017-10-14T22:56:55Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![peterkshultz](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/peterkshultz/32/731_2.png) [@peterkshultz](https://discourse.slicer.org/u/peterkshultz)\
**Post date:** [October 14, 2017, 10:56pm UTC](https://discourse.slicer.org/t/failed-build-on-windows/1228/1 "2017-10-14T22:56:55Z")

</div>

**Operating system:** Windows 10  
**Slicer version:** 4.7.0-2010-10-10  
**Expected behavior:** Install and open build; open DICOM file.  
**Actual behavior:** Install and open build with some errors; cannot open DICOM file.

Full console output is here:

> **Console Log**
>
> ```
> Number of registered modules: 140
> Traceback (most recent call last):
> File "<string>", line 1, in <module>
> File "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/DICOM.py", line 11, in <module>
> import DICOMLib
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\DICOMLib\ __init__.py", line 4, in <module>
> from DICOMWidgets import *
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\DICOMLib\DICOMWidgets.py", line 8, in <module>
> from ctk import ctkDICOMObjectListWidget, ctkDICOMDatabase, ctkDICOMIndexer, ctkDICOMBrowser, ctkPopupWidget, ctkExpandButton
> ImportError: cannot import name ctkPopupWidget
> loadSourceAsModule - Failed to load file "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/DICOM.py" as module "DICOM" !
> Fail to instantiate module "DICOM"
> Traceback (most recent call last):
> File "<string>", line 1, in <module>
> File "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/DICOMScalarVolumePlugin.py", line 4, in <module>
> from DICOMLib import DICOMPlugin
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\DICOMLib\ __init__.py", line 4, in <module>
> from DICOMWidgets import *
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\DICOMLib\DICOMWidgets.py", line 8, in <module>
> from ctk import ctkDICOMObjectListWidget, ctkDICOMDatabase, ctkDICOMIndexer, ctkDICOMBrowser, ctkPopupWidget, ctkExpandButton
> ImportError: cannot import name ctkPopupWidget
> loadSourceAsModule - Failed to load file "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/DICOMScalarVolumePlugin.py" as module "DICOMScalarVolumePlugin" !
> Fail to instantiate module "DICOMScalarVolumePlugin"
> Traceback (most recent call last):
> File "<string>", line 1, in <module>
> File "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/DICOMSlicerDataBundlePlugin.py", line 3, in <module>
> from DICOMLib import DICOMPlugin
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\DICOMLib\ __init__.py", line 4, in <module>
> from DICOMWidgets import *
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\DICOMLib\DICOMWidgets.py", line 8, in <module>
> from ctk import ctkDICOMObjectListWidget, ctkDICOMDatabase, ctkDICOMIndexer, ctkDICOMBrowser, ctkPopupWidget, ctkExpandButton
> ImportError: cannot import name ctkPopupWidget
> loadSourceAsModule - Failed to load file "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/DICOMSlicerDataBundlePlugin.py" as module "DICOMSlicerDataBundlePlugin" !
> Fail to instantiate module "DICOMSlicerDataBundlePlugin"
> Traceback (most recent call last):
> File "<string>", line 1, in <module>
> File "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/ExtensionWizard.py", line 12, in <module>
> from ExtensionWizardLib import *
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\ExtensionWizardLib\ __init__.py", line 9, in <module>
> from SettingsPanel import SettingsPanel
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\ExtensionWizardLib\SettingsPanel.py", line 49, in <module>
> class SettingsPanel(ctk.ctkSettingsPanel):
> AttributeError: 'module' object has no attribute 'ctkSettingsPanel'
> loadSourceAsModule - Failed to load file "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/ExtensionWizard.py" as module "ExtensionWizard" !
> Fail to instantiate module "ExtensionWizard"
> Traceback (most recent call last):
> File "<string>", line 1, in <module>
> File "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/JRC2013Vis.py", line 4, in <module>
> from DICOMLib import DICOMUtils
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\DICOMLib\ __init__.py", line 4, in <module>
> from DICOMWidgets import *
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\DICOMLib\DICOMWidgets.py", line 8, in <module>
> from ctk import ctkDICOMObjectListWidget, ctkDICOMDatabase, ctkDICOMIndexer, ctkDICOMBrowser, ctkPopupWidget, ctkExpandButton
> ImportError: cannot import name ctkPopupWidget
> loadSourceAsModule - Failed to load file "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/JRC2013Vis.py" as module "JRC2013Vis" !
> Fail to instantiate module "JRC2013Vis"
> Traceback (most recent call last):
> File "<string>", line 1, in <module>
> File "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/MultiVolumeImporterPlugin.py", line 5, in <module>
> import DICOMLib
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\DICOMLib\ __init__.py", line 4, in <module>
> from DICOMWidgets import *
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\DICOMLib\DICOMWidgets.py", line 8, in <module>
> from ctk import ctkDICOMObjectListWidget, ctkDICOMDatabase, ctkDICOMIndexer, ctkDICOMBrowser, ctkPopupWidget, ctkExpandButton
> ImportError: cannot import name ctkPopupWidget
> loadSourceAsModule - Failed to load file "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/MultiVolumeImporterPlugin.py" as module "MultiVolumeImporterPlugin" !
> Fail to instantiate module "MultiVolumeImporterPlugin"
> Traceback (most recent call last):
> File "<string>", line 1, in <module>
> File "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/RSNAVisTutorial.py", line 4, in <module>
> from DICOMLib import DICOMUtils
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\DICOMLib\ __init__.py", line 4, in <module>
> from DICOMWidgets import *
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\DICOMLib\DICOMWidgets.py", line 8, in <module>
> from ctk import ctkDICOMObjectListWidget, ctkDICOMDatabase, ctkDICOMIndexer, ctkDICOMBrowser, ctkPopupWidget, ctkExpandButton
> ImportError: cannot import name ctkPopupWidget
> loadSourceAsModule - Failed to load file "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/RSNAVisTutorial.py" as module "RSNAVisTutorial" !
> Fail to instantiate module "RSNAVisTutorial"
> Traceback (most recent call last):
> File "<string>", line 1, in <module>
> File "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/SubjectHierarchyGenericSelfTest.py", line 5, in <module>
> from DICOMLib import DICOMUtils
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\DICOMLib\ __init__.py", line 4, in <module>
> from DICOMWidgets import *
> File "C:\Users\peter\Desktop\debug\Slicer-build\lib\Slicer-4.7\qt-scripted-modules\DICOMLib\DICOMWidgets.py", line 8, in <module>
> from ctk import ctkDICOMObjectListWidget, ctkDICOMDatabase, ctkDICOMIndexer, ctkDICOMBrowser, ctkPopupWidget, ctkExpandButton
> ImportError: cannot import name ctkPopupWidget
> loadSourceAsModule - Failed to load file "C:/Users/peter/Desktop/debug/Slicer-build/lib/Slicer-4.7/qt-scripted-modules/SubjectHierarchyGenericSelfTest.py" as module "SubjectHierarchyGenericSelfTest" !
> Fail to instantiate module "SubjectHierarchyGenericSelfTest"
> Number of instantiated modules: 132
> Traceback (most recent call last):
> File "C:/Users/peter/Desktop/debug/Slicer-build/bin/Python/slicer/slicerqt.py", line 54, in emit
> self.pythonToCtkLevelConverter[record.levelno], self.origin, context, record.msg)
> AttributeError: 'SlicerApplicationLogHandler' object has no attribute 'pythonToCtkLevelConverter'
> Logged from file AbstractScriptedSubjectHierarchyPlugin.py, line 36
> When loading module "DICOMPatcher" , the dependency "DICOM" failed to be loaded.
> Traceback (most recent call last):
> File "C:/Users/peter/Desktop/debug/Slicer-build/bin/Python/slicer/slicerqt.py", line 54, in emit
> self.pythonToCtkLevelConverter[record.levelno], self.origin, context, record.msg)
> AttributeError: 'SlicerApplicationLogHandler' object has no attribute 'pythonToCtkLevelConverter'
> Logged from file AbstractScriptedSubjectHierarchyPlugin.py, line 36
> Traceback (most recent call last):
> File "C:/Users/peter/Desktop/debug/Slicer-build/bin/Python/slicer/slicerqt.py", line 54, in emit
> self.pythonToCtkLevelConverter[record.levelno], self.origin, context, record.msg)
> AttributeError: 'SlicerApplicationLogHandler' object has no attribute 'pythonToCtkLevelConverter'
> Logged from file AbstractScriptedSubjectHierarchyPlugin.py, line 36
> Number of loaded modules: 131
> 
> ```

Build errors from Visual Studio are here:

> **Build errors**
>
> ```
> Description File Line Column Project   
> Error	1	error MSB6006: "cmd.exe" exited with code 1. [C:\Users\peter\Desktop\debug\CTK-build\CTK-build\Libs\Widgets\CTKWidgetsPythonQt.vcxproj] [C:\Users\peter\Desktop\debug\CTK-build\CTK.vcxproj]	C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.CppCommon.targets	170	5	CTK
> 
> Error	2	error MSB6006: "cmd.exe" exited with code 1. [C:\Users\peter\Desktop\debug\CTK-build\CTK-build\Libs\Widgets\CTKWidgetsPythonQt.vcxproj] [C:\Users\peter\Desktop\debug\CTK-build\CTK.vcxproj]	C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.CppCommon.targets	170	5	CTK
> 
> Error	3	error MSB6006: "cmd.exe" exited with code 1. [C:\Users\peter\Desktop\debug\CTK-build\CTK-build\Libs\Widgets\CTKWidgetsPythonQt.vcxproj] [C:\Users\peter\Desktop\debug\CTK-build\CTK.vcxproj]	C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.CppCommon.targets	170	5	CTK
> 
> Error	4	error MSB6006: "cmd.exe" exited with code 1. [C:\Users\peter\Desktop\debug\CTK-build\CTK-build\Libs\Widgets\CTKWidgetsPythonQt.vcxproj] [C:\Users\peter\Desktop\debug\CTK-build\CTK.vcxproj]	C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.CppCommon.targets	170	5	CTK
> 
> ```

Any suggestions?

---

<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:** [October 14, 2017, 11:10pm UTC](https://discourse.slicer.org/t/failed-build-on-windows/1228/2 "2017-10-14T23:10:34Z")

</div>

What Visual Studio and Qt version do you use?  
Have you built Qt as described in the build instructions?  
Please post build errors that you get when building …\CTK-build\CTK-build\CTK.sln project.

---

<div class="post-metadata">

**Author:** ![peterkshultz](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/peterkshultz/32/731_2.png) [@peterkshultz](https://discourse.slicer.org/u/peterkshultz)\
**Post date:** [October 14, 2017, 11:53pm UTC](https://discourse.slicer.org/t/failed-build-on-windows/1228/3 "2017-10-14T23:53:33Z")

</div>

Thanks for the reply, Andras.

**Visual Studio:** 2013, Update 5  
**Qt:** qt-4.8.7-64-vs2013-deb

I built Qt by using [this](https://github.com/jcfr/qt-easy-build/tree/4.8.7#windows), which I believe was included in the build instructions.

Build log for CTK.sln after doing `BUILD_ALL`:

> **Build log**
>
> ```
> 1>------ Build started: Project: CTKCore, Configuration: Debug x64 ------
> 2>------ Build started: Project: CopyCTKScriptingPythonCorePythonScriptFiles, Configuration: Debug x64 ------
> 1> CTKCore.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKCore.dll
> 3>------ Build started: Project: CompileCTKScriptingPythonCorePythonFiles, Configuration: Debug x64 ------
> 4>------ Build started: Project: CTKVisualizationVTKCore, Configuration: Debug x64 ------
> 5>------ Build started: Project: CTKWidgets, Configuration: Debug x64 ------
> 4> CTKVisualizationVTKCore.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKVisualizationVTKCore.dll
> 6>------ Build started: Project: CTKDICOMCore, Configuration: Debug x64 ------
> 5> CTKWidgets.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKWidgets.dll
> 6> CTKDICOMCore.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKDICOMCore.dll
> 7>------ Build started: Project: CTKScriptingPythonCore, Configuration: Debug x64 ------
> 7> CTKScriptingPythonCore.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKScriptingPythonCore.dll
> 8>------ Build started: Project: CTKVisualizationVTKWidgets, Configuration: Debug x64 ------
> 9>------ Build started: Project: CTKDICOMWidgets, Configuration: Debug x64 ------
> 8> CTKVisualizationVTKWidgets.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKVisualizationVTKWidgets.dll
> 10>------ Build started: Project: CTKImageProcessingITKCore, Configuration: Debug x64 ------
> 9> CTKDICOMWidgets.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKDICOMWidgets.dll
> 11>------ Build started: Project: CTKQtTesting, Configuration: Debug x64 ------
> 11> CTKQtTesting.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKQtTesting.dll
> 12>------ Build started: Project: CTKScriptingPythonWidgets, Configuration: Debug x64 ------
> 13>------ Build started: Project: CTKCorePythonQt, Configuration: Debug x64 ------
> 13> CTKCorePythonQt.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKCorePythonQt.pyd
> 12> CTKScriptingPythonWidgets.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKScriptingPythonWidgets.dll
> 14>------ Build started: Project: CTKDICOMCorePythonQt, Configuration: Debug x64 ------
> 14> CTKDICOMCorePythonQt.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKDICOMCorePythonQt.pyd
> 15>------ Build started: Project: CTKDICOMWidgetsPlugins, Configuration: Debug x64 ------
> 15> CTKDICOMWidgetsPlugins.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\designer\Debug\CTKDICOMWidgetsPlugins.dll
> 16>------ Build started: Project: CTKDICOMWidgetsPythonQt, Configuration: Debug x64 ------
> 16> CTKDICOMWidgetsPythonQt.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKDICOMWidgetsPythonQt.pyd
> 17>------ Build started: Project: CTKImageProcessingITKCorePythonQt, Configuration: Debug x64 ------
> 17> CTKImageProcessingITKCorePythonQt.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKImageProcessingITKCorePythonQt.pyd
> 18>------ Build started: Project: CTKQtTestingPythonQt, Configuration: Debug x64 ------
> 19>------ Build started: Project: CTKScriptingPythonWidgetsPlugins, Configuration: Debug x64 ------
> 18> CTKQtTestingPythonQt.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKQtTestingPythonQt.pyd
> 20>------ Build started: Project: CTKScriptingPythonWidgetsPythonQt, Configuration: Debug x64 ------
> 19> CTKScriptingPythonWidgetsPlugins.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\designer\Debug\CTKScriptingPythonWidgetsPlugins.dll
> 20> CTKScriptingPythonWidgetsPythonQt.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKScriptingPythonWidgetsPythonQt.pyd
> 21>------ Build started: Project: CTKVisualizationVTKCorePythonQt, Configuration: Debug x64 ------
> 21> CTKVisualizationVTKCorePythonQt.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKVisualizationVTKCorePythonQt.pyd
> 22>------ Build started: Project: CTKVisualizationVTKWidgetsPlugins, Configuration: Debug x64 ------
> 23>------ Build started: Project: CTKVisualizationVTKWidgetsPythonQt, Configuration: Debug x64 ------
> 23> CTKVisualizationVTKWidgetsPythonQt.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\CTKVisualizationVTKWidgetsPythonQt.pyd
> 24>------ Build started: Project: CTKWidgetsPlugins, Configuration: Debug x64 ------
> 25>------ Build started: Project: CTKWidgetsPythonQt, Configuration: Debug x64 ------
> 24> CTKWidgetsPlugins.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\designer\Debug\CTKWidgetsPlugins.dll
> 26>------ Build started: Project: ctkDICOM, Configuration: Debug x64 ------
> 25> Building Custom Rule C:/Users/peter/Desktop/debug/CTK/Libs/Widgets/CMakeLists.txt
> 25> CMake does not need to re-run because C:\Users\peter\Desktop\debug\CTK-build\CTK-build\Libs\Widgets\CMakeFiles\generate.stamp is up-to-date.
> 25> PythonQt Wrapping - Generating generated_cpp/org_commontk_CTKWidgets/org_commontk_CTKWidgets_init.cpp
> 25> Traceback (most recent call last):
> 25> File "C:/Users/peter/Desktop/debug/CTK/CMake/ctkWrapPythonQt.py", line 237, in <module>
> 25> ctk_wrap_pythonqt(options.target, options.namespace, options.output_dir, args, options.extra_verbose)
> 25> File "C:/Users/peter/Desktop/debug/CTK/CMake/ctkWrapPythonQt.py", line 77, in ctk_wrap_pythonqt
> 25> with open(input_file) as f:
> 25> IOError: [Errno 2] No such file or directory: 'C:/Users/peter/Desktop/debug/CTK/Libs/Widgets/ctkRangeSliderEvenTranslator.h'
> 25>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.CppCommon.targets(170,5): error MSB6006: "cmd.exe" exited with code 1.
> 26> ctkDICOM.vcxproj -> C:\Users\peter\Desktop\debug\CTK-build\CTK-build\bin\Debug\ctkDICOM.exe
> 27>------ Build started: Project: ALL_BUILD, Configuration: Debug x64 ------
> 27> Building Custom Rule C:/Users/peter/Desktop/debug/CTK/CMakeLists.txt
> 27> CMake does not need to re-run because C:\Users\peter\Desktop\debug\CTK-build\CTK-build\CMakeFiles\generate.stamp is up-to-date.
> ========== Build: 26 succeeded, 1 failed, 1 up-to-date, 0 skipped ==========
> 
> ```

Build errors:

> **Build errors**
>
> `Error	1	error MSB6006: "cmd.exe" exited with code 1.	C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.CppCommon.targets	170	5	CTKWidgetsPythonQt`

Let me know if you need anything else.

---

<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:** [October 15, 2017, 12:27am UTC](https://discourse.slicer.org/t/failed-build-on-windows/1228/4 "2017-10-15T00:27:36Z")

</div>

This seems like the right way to build Slicer. Do you have another python installed on your computer?

---

<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:** [October 15, 2017, 12:45am UTC](https://discourse.slicer.org/t/failed-build-on-windows/1228/5 "2017-10-15T00:45:36Z")

</div>

Yes, make sure Python executable’s folder is not added to PATH environment variable at user or system level.

---

<div class="post-metadata">

**Author:** ![msmolens](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/msmolens/32/139_2.png) [@msmolens](https://discourse.slicer.org/u/msmolens)\
**Post date:** [October 16, 2017, 2:44pm UTC](https://discourse.slicer.org/t/failed-build-on-windows/1228/6 "2017-10-16T14:44:53Z")

</div>

> `IOError: [Errno 2] No such file or directory: 'C:/Users/peter/Desktop/debug/CTK/Libs/Widgets/ctkRangeSliderEvenTranslator.h'`

The path of your build directory is likely too long. That typically results in errors like above, where a letter is missing from the filename (the “`t`” in `Event`").

[Documentation/Nightly/Developers/Build Instructions - Slicer Wiki](https://www.slicer.org/wiki/Documentation/Nightly/Developers/Build_Instructions#Windows_2) suggests using a short path like `C:\S4D`.