QML module not found error

[Ayush107]

import QtQuick.Controls
import QtQuick.Layouts
import QtQuick.Controls.Material
import LinearRegression 1.0 <-------------------Error here in Qt design studio

Window {
    id: window
    width: Screen.width
    height: Screen.height
    visible: true
    title: qsTr("NeuralFlow")

    ColumnLayout {
        id: column
        width: 200
        height: 200
        anchors.verticalCenter: parent.verticalCenter
        anchors.horizontalCenter: parent.horizontalCenter

}

Below are the contents of .qmlproject file :

import qmlproject 1.0

Project {
    name: "NeuralFlowProject"
    version: "1.0"
    mainFile : "Main.qml"
    // Define source directories and files
    files: [
        "Main.qml",
    ]

    // Optionally include Qt modules or dependencies
    QtModules: [
        "QtQuick",
        "QtQuick.Controls"
    ]

    QmlModules: [
        {
            name: "LinearRegression"
            versions: ["1.0"]
        }
    ]
}

Note that, LinearRegression is a c++ class registered via qmlRegisterSingletonInstance, the application overall works as expected, but i am not able to get the preview of the design in Qt Design studio.
Is there any way to make the error go away ( and instead have placeholder content, so i can preview the design ).

[Ayush107]

Issue fixed, closing thread.

[t.vanbesien]

How did you fix it?