Bug 420441

Summary: org.kde.kcm1.2 : QML module does not contain information about components contained in plugins.
Product: [Frameworks and Libraries] frameworks-kcmutils Reporter: 319513897 <319513897>
Component: generalAssignee: kdelibs bugs <kdelibs-bugs-null>
Status: REPORTED ---    
Severity: major    
Priority: NOR    
Version First Reported In: 5.69.0   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description 319513897@outlook.com 2020-04-23 03:25:52 UTC
SUMMARY
kde setting -> locale setting -> language -> add language can't work.
When I try add new language from "language", it had nothing happend.
I use "journalctl -xb" found some error : 

4月 23 11:14:50 dragon systemsettings5[14280]: QQmlEngine::setContextForObject(): Object already has a QQmlContext
4月 23 11:14:50 dragon systemsettings5[14280]: kf5.ki18n: "1 instead of 2 arguments to message {无法找到代码为“%2”的语言的翻译文件。...} supplied before conversion."
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:43: TypeError: Cannot read property 'display' of null
4月 23 11:14:50 dragon systemsettings5[14280]: file:///usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml:39: TypeError: Cannot read property 'LanguageCode' of null
4月 23 11:14:52 dragon systemsettings5[14280]: Couldn't load plugin: "共享库没有被找到。"

I open /usr/share/kpackage/kcms/kcm_translations/contents/ui/main.qml with qtcreator, it has an error at "import org.kde.kcm 1.2
" : QML module does not contain information about components contained in plugins.

STEPS TO REPRODUCE
1. Install ArchLinux with "plasma" package and some other package.
2. Step into kde-desktop
3. Try to add new language

OBSERVED RESULT

Nothing happend, but 'journalctl -xb' could found some error log.

EXPECTED RESULT

Add new language surely.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5,69.0
Qt Version: 5.14.2

ADDITIONAL INFORMATION

ArchLinux with plasma, kf5, etc. packages