Error while deploying from Ubuntu 14.04 to Raspberry Pi 3

[MHermann]

Hi!

I set up Qt 5.9.1 on Ubuntu 14.04 and I compiled Qt 5.9.1 for Raspberry Pi 3.
After that I configured QtCreator for Raspberry Pi 3.
So far so good.

I created a standard Qt Quick Application for testing.
On Ubuntu everything is fine.
But when I am selecting the Kit for Raspi and try run it on the Raspi I get an error:

QQmlApplicationEngine failed to load component
file::/main.qml:-1 File not found

This is the code in the main.cpp:

#include <QGuiApplication>
#include <QQmlApplicationEngine>

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
    QQmlApplicationEngine engine;
    engine.load(QUrl("qrc:/main.qml"));
    if (engine.rootObjects().isEmpty())
        return -1;

    return app.exec();
}

Obviously there seems to be a problem with the ressources.
I searched in the internet for a solution but without success.

Has anyone an idea what the problem could be?

Regards, MHermann

[sneubert]

For remote targets you need to add a deploy step, to copy the application to the remote target. Is there something like

target.path = /home/pi
INSTALLS + = target

in your .pro file?

[MHermann]

@sneubert: Thanks for your answer.
I already added two lines like these to the end of my .pro file.
The problem seems to be related to QtQuick.
Because if I run a Qt Widgets Application it works on Ubuntu and on the Raspi.
But if I try to run a Qt Quick Application it works on Ubuntu, but I get these two errors on the Raspi.

QQmlApplicationEngine failed to load component
file::/main.qml:-1 File not found

I don't have that much experience with Qt and Raspi...
Maybe there has to be an additional library or I have to install something on the Raspi or I have to set a path???

[MHermann]

I found the problem and the solution.
There were still old Qt 5.6 libraries on the Raspi.
I copied the Qt libraries from the locally mounted Raspi image to the Raspi via rsync.
And now the applications are running on the Raspi.

[pfar94]

@MHermann Stuck with exact same problem. Can you be more specific on how you solved it? i don't understand the solution you put down here. can you be detailed?