Problem importing knxproj file

I am trying to upload my knxproj file to my Homey Pro and I get the following message, in swedish:

Ingen giltig gruppadress-XML hittades i projektfilen. Vänligen ladda upp ett annat projekt.

In english:
No valid group address XML was found in the project file. Please upload a different project.

Does anyone know what might be causing the problem?

I think I have located the problem. The project file is password protected and I assume that’s why the file can not be imported. I will try to get a project file that is not password protected.