# Slicer build error - ‘class QLatin1String’ has no member named ‘arg’de

**URL:** <https://discourse.slicer.org/t/slicer-build-error-class-qlatin1string-has-no-member-named-arg-de/32747>\
**Category:** Development\
**Created:** [November 11, 2023, 6:48pm UTC](https://discourse.slicer.org/t/slicer-build-error-class-qlatin1string-has-no-member-named-arg-de/32747 "2023-11-11T18:48:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ankit\_Mishra](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ankit_mishra/32/68271_2.png) [@Ankit\_Mishra](https://discourse.slicer.org/u/Ankit_Mishra)\
**Post date:** [November 11, 2023, 6:48pm UTC](https://discourse.slicer.org/t/slicer-build-error-class-qlatin1string-has-no-member-named-arg-de/32747/1 "2023-11-11T18:48:15Z")

</div>

/home/ankit/Slicer/Base/QTGUI/qSlicerExtensionsLocalWidget.cxx: In member function ‘void {anonymous}::qSlicerExtensionsDescriptionLabel::labelText(const QString&)’:  
/home/ankit/Slicer/Base/QTGUI/qSlicerExtensionsLocalWidget.cxx:431:84: error: ‘class QLatin1String’ has no member named ‘arg’  
431 | g style="float: left" src=":/Icons/ExtensionIncompatible.svg"/\> ").arg(this-\>WarningColor) +  
| ^~~

make[5]: \*\*\* [Base/QTGUI/CMakeFiles/qSlicerBaseQTGUI.dir/build.make:1269: Base/QTGUI/CMakeFiles/qSlicerBaseQTGUI.dir/qSlicerExtensionsLocalWidget.cxx.o] Error 1  
make[4]: \*\*\* [CMakeFiles/Makefile2:9810: Base/QTGUI/CMakeFiles/qSlicerBaseQTGUI.dir/all] Error 2  
make[3]: \*\*\* [Makefile:163: all] Error 2  
make[2]: \*\*\* [CMakeFiles/Slicer.dir/build.make:143: Slicer-prefix/src/Slicer-stamp/Slicer-build] Error 2  
make[1]: \*\*\* [CMakeFiles/Makefile2:196: CMakeFiles/Slicer.dir/all] Error 2  
make: \*\*\* [Makefile:95: all] Error 2

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<div class="post-metadata">

**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [November 11, 2023, 9:32pm UTC](https://discourse.slicer.org/t/slicer-build-error-class-qlatin1string-has-no-member-named-arg-de/32747/2 "2023-11-11T21:32:15Z")

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> [@Ankit\_Mishra](#):
>
> QLatin1String

That’s from using an older version of Qt, since [that method](https://doc.qt.io/qt-5/qlatin1string.html#arg) was introduced in 5.14. Updating to 5.15 is recommended.