I installed plasmatube without any other KDE applications just to test it out and it will not launch without errors. I installed sonnet to see if that solved it but the error is the same. I suspect something is needed in WANTLIB or something like that but I'm not quite sure. Error below. Will plasmatube not run independently of the rest of KDE?
Bryan $ plasmatube Detected locale "C" with character encoding "US-ASCII", which is not UTF-8. Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead. If this causes problems, reconfigure your locale. See the locale(1) manual for more information. QQmlApplicationEngine failed to load component qrc:/qt/qml/org/kde/plasmatube/ui/Main.qml:67:19: Type Sidebar unavailable qrc:/qt/qml/org/kde/plasmatube/ui/components/Sidebar.qml:42:9: Type QQC2.ToolBar unavailable qrc:/qt/qml/org/kde/desktop/ToolBar.qml: Type GlobalSonnetSettings unavailable qrc:/qt/qml/org/kde/desktop/private/GlobalSonnetSettings.qml:10:1: module "org.kde.sonnet" is not installed