I got the error message above in starting my QML application. I used console-trdx-image to create the image of my rootfs. I added the following lines to local.conf to enable Qt (local.conf contains qtdeclarative and qtquickcontrols)
IMAGE_INSTALL_append = " \ qtbase \ qtbase-fonts \ qtbase-plugins \ qtdeclarative \ qt3d \ qtgraphicaleffects \ qtconnectivity \ qtquickcontrols \ qtquick1 \ qtimageformats \ qtenginio \ qtlocation \ qtmultimedia \ qtsensors \ qtscript \ qtserialport \ qtsvg \ qtcanvas3d \ qttranslations \ qtsystems \ qtxmlpatterns \ qttools \ " DISTRO_FEATURES_remove = "x11 wayland" IMAGE_INSTALL_remove = "eglinfo-x11" ACCEPT_FSL_EULA = "1"
The qml-files and code to use QtQuick controls normally resides in the the folder /usr/libqt5/qmlQtQuick/Controls. But there exists no folder Controls at all.If I search the QtQuick control Slider.qml ( find . -name Slider.qml) at the starting point of rootfs there is nothing found at all. Normally the folder Controls should contain about 20 qml files and the lib libqtquickcontrolsplugin.so.