[Beginner][Transition between 2 pages] Errors by creating the second page

[Shadow.01]

Hi all,
I am totally new to QT system. In order to try the basics operations, I am trying to create a simple QT empty project with two forms and, in each form, a button to pass from a form to the other. That's all.

1. I started by creating a new QT Quick Application - Empty
2. I created the second form by Create new -> QT Designer form class -> Dialog with buttons

Nothing else. And, at this point, I see the following error. Why? Have I do some mistakes?

Thank you very much,

[jsulm]

@Shadow-01 Do you have

QT += widgets

in the pro file?

[jsulm]

@Shadow-01 Please show the content of dialog.h
Also: does the project build? The errors are probably from code model. Just try to build.

[Shadow.01]

Thanks for the super fast reply!

This is the content of dialog.h.

The project doesn't build I see the following error.

[jsulm]

@Shadow-01 Do you have

QT += widgets

in the pro file?

[Shadow.01]

No, I didn't! Now I have and it's compile. You solved a part of my problem at the speed of the light! :-)

Now I would ask you the last part, how can I put a buttom in the first form (I have only a QML file, without any .ui corresponding user interface), in order to open the second one?

Thanks again so much for your helping!

[jsulm]

@Shadow-01 So, you are mixing QML and Qt Widgets? Is there a reason for this? If you need to do so see https://doc.qt.io/qt-5/qtqml-cppintegration-topic.html which is somewhat advanced topic.

[Shadow.01]

Sorry, I have seen that I ask 2 things in the same post; I don't want to violate the rules of the forum and I put a new question. Thanks, post solved. I put the other question in a new discussion.