QtCreator unable to import Plasma5 plugins

// General messages 

Module path: /usr/lib64/qt5/qml/org/kde/taskmanager
 See "Using QML Modules with Plugins" in the documentation.
Automatic type dump of QML module failed.
 Errors:
 "/usr/lib64/qt5/bin/qmlplugindump" returned exit code 253.
 Arguments: -nonrelocatable org.kde.taskmanager 0.1 .
 QObject: Cannot create children for a parent that is in a different thread.
 (Parent is QGuiApplication(0x561024337d80), parent's thread is QThread(0x561024337e20), current thread is QThread(0x56102433c250)
 QObject: Cannot create children for a parent that is in a different thread.
 (Parent is QGuiApplication(0x561024337d80), parent's thread is QThread(0x561024337e20), current thread is QThread(0x56102433c250)
 QObject: Cannot create children for a parent that is in a different thread.
 (Parent is QGuiApplication(0x561024337d80), parent's thread is QThread(0x561024337e20), current thread is QThread(0x56102433c250)
 Could not find any platform plugin
 QWidget: Cannot create a QWidget without QApplication

// qmlplugindump -noinstantiate org.kde.taskmanager 0.1 | head

// This file describes the plugin-supplied types contained in the library.
// It is used for QML tooling purposes only.
//
// This file was auto-generated by:
// 'qmlplugindump -noinstantiate org.kde.taskmanager 0.1'

Module {
    dependencies: ["QtQuick 2.8"]