You can now run your HMI on the target using Qt Creator.
# slay -12 homescreen
You have to stop the default HMI to ensure that your new HMI appears on the screen. The default HMI runs in the foreground and any application that you launch will have a z-order less than that of the default HMI and hence, won't be visible (and no error message will be displayed).
You must slay the homescreen also when you want to run an application developed with QNX SDK for Apps and Media 1.0 on a target running QNX Apps and Media 1.1. This is because when Qt Creator runs an application, it simply copies it to the target and executes it (without considering z-order).
The HMI application runs and you should see it on the screen of the target:
Qt Creator stops the application and displays a message saying the application was user-terminated and containing the exit code, in the Application Output window.