I am learning trying to learn QML. Unfortunately I run into the Item could not be created issue when I open the .qml file in the Qt Quick Designer and only see an empty 2D preview. If I try to modify anything it crashes so I ran QtCreator from the terminal and got the following output: 

PropertyEditor: invalid node for setup
qtc.imagecontainer.debug: void QmlDesigner::readSharedMemory(qint32, QmlDesigner::ImageContainer&) Not able to create image: 0 0 0
qtc.imagecontainer.debug: void QmlDesigner::readSharedMemory(qint32, QmlDesigner::ImageContainer&) Not able to create image: 0 0 0
Segmentation fault (core dumped)

I have tried several solutions from the forums such setting the QtQuick version or changing the QML, but it seems that the one that is agreed works is downgrading to QtCreator 11.