Looks like your qmls are located in wrong path.

Unfortuantely the default project does not pack the qml file into a resource. That means the qml-file may get lost easily. The build script has deployment options to copy the qml file, however I find this very brittle. Bottom line:

• Make sure that the qml file is located where it is expected by the executable.
• To get a stable solution put the qml file in a resource.

Ok. Thank you!
Can you explain me about putting qml into resource, please?

Sure:
Select in Creator: File->New->Qt->Resource file
This will add a resource file to your project and give you a graphical editor that permits to select files which will be included in the binary file. Next step is to access the files that reside inside your executable:

As URL:

To access the file itself:

Yeah! Excellent! Thanks a lot!