White screen with cursor on Rpi4 when deploy QML demo app

[Kuzma30]

I use boot2qt qt6-dev branch.
When I deploy Widget based demo app it works fine. Then I try to deploy (with Qt Creator) QML based demo I see on device screen only cursor. Screen is white.
This is output of Qt Creator

14:42:21: Starting /usr/bin/appcontroller /usr/bin/appCM41 on CM4...
Warning: Identity file  not accessible: No such file or directory.
qt.core.qobject.connect: QObject::connect: signal not found in QProcess
"QTWEBENGINE_DISABLE_SANDBOX" "1"
"QT_IM_MODULE" "qtvirtualkeyboard"
"QT_QPA_EGLFS_ALWAYS_SET_MODE" "'1'"
"QT_QPA_EGLFS_FORCE888" "1"
"QT_QPA_EGLFS_KMS_ATOMIC" "1"
"QT_QPA_PLATFORM" "eglfs"
"WAYLAND_DISPLAY" "/run/wayland-0"
"XDG_RUNTIME_DIR" "/run/user/0"
"/usr/bin/appCM41" QList()

[SGaist]

Hi and welcome to devnet,

Boot2Qt being a commercial offering you should contact the Qt Company.

You should also add which device you are using, if it has a GPU, etc.

[Kuzma30]

I found error in my QML code. Problem solved.

[SGaist]

What was it ?

[Kuzma30]

I compile app without
Window {
width: 640
height: 480
visible: true
}