Qt5 QML Unknown component

[PDLAOZEI]

Because of the need of work, I changed build system from qmake to cmake.
I found a problem that the program works properly, but calls MyRectangle.qml under other files in main.qml to prompt Unknown component. (M300),
On qmake, this problem does not exist as long as qrc is prefixed with "/". just like this

what should I do?

Qt version: Qt 5.15.2
Build system: CMake

cmake_minimum_required(VERSION 3.14)

project(untitled VERSION 0.1 LANGUAGES CXX)

......

find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Core Quick)
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Core Quick)

set(PROJECT_SOURCES
        main.cpp
        qml.qrc
        ./Extend/extend.qrc
)

if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
    qt_add_executable(untitled
        MANUAL_FINALIZATION
        ${PROJECT_SOURCES}
    )
......

The structure of the whole project is shown in the figure

main.qml

import QtQuick 2.15
import QtQuick.Window 2.15

Window {
    width: 640
    height: 480
    visible: true
    MyRectangle{                          ----- UnKnown component. (M300)
        anchors.fill: parent
    }
}

MyRectangle.qml

import QtQuick 2.15
import QtQuick.Controls 2.15

Rectangle {
    Label{
        anchors.centerIn: parent
        text: "hello world"
    }
}

I have tried to add qrc files using qt5_add_resources，and try Tools > QML/JS > Reset Code Model but the problem still exists
In my opinion, Maybe it's a good idea for me to use QML_DIR to turn qml into a module?
Thanks....

[sierdzio]

Yup, that's pretty normal. Qt Creator is not very clever when it comes to QML and custom components.

[sierdzio]

So the app works fine, and only in Qt Creator you get this M300 warning? I just ignore this.

[PDLAOZEI]

@sierdzio Yes, according to the above code, you can see.

In fact, the code cannot use ctrl + click to jump to the corresponding file and provide any hints

[sierdzio]

Yup, that's pretty normal. Qt Creator is not very clever when it comes to QML and custom components.

[PDLAOZEI]

@sierdzio i see, Can I avoid this if I use a higher version of qt or other methods?

[sierdzio]

I don't know, I'm also stuck on Qt 5 ;-)

[PDLAOZEI]

@sierdzio Thank you for your answer to solve my doubts.
I think we can try qmldir or discuss with colleagues about switching the project back to use qmake. XD