Thank you contra, I should have found it…must have had a laziness crisis… 
Anyway, it works further this way.
The app starts but the wheel is spinning.
Here is the console output
Summary
[D] unknown:0 - Using Wayland-EGL
[D] unknown:0 - Got library name: “/usr/lib/qt5/qml/io/thp/pyotherside/libpyothersideplugin.so”
[W] unknown:90 - file:///usr/share/harbour-tidalplayer/qml/pages/FirstPage.qml:90:9: QML SlideshowView: Cannot anchor to an item that isn’t a parent or sibling.
[D] unknown:0 - “PyOtherSide error: No module named ‘playlistmanager’”
[W] unknown:0 - Unhandled PyOtherSide error: Cannot import module: playlistmanager (No module named ‘playlistmanager’)
[D] isTokenValid:53 - -1
[D] checkAndLogin:43 - old token invalid
[D] loginIn:426 -
[W] unknown:0 - QQmlContext: Cannot set context object on invalid context.
[W] unknown:0 - QQmlComponent: Cannot create a component in an invalid context
[W] unknown:0 - QQmlContext: Cannot set context object on invalid context.
[W] unknown:0 - QQmlComponent: Cannot create a component in an invalid context
[W] unknown:0 - QQmlContext: Cannot set context object on invalid context.
[W] unknown:0 - QQmlComponent: Cannot create a component in an invalid context
[D] :113 - Playlistmanager module imported successfully
[D] generateList:332 - Playlist changed from main.qml
[D] generateList:203 - Generate current database
[D] unknown:0 - “PyOtherSide error: Traceback (most recent call last):\n\n File “”, line 1, in \n\nNameError: name ‘playlistmanager’ is not defined\n”
[W] unknown:0 - Unhandled PyOtherSide error: Function not found: ‘playlistmanager.PL.size’ (Traceback (most recent call last):
File “”, line 1, in
NameError: name ‘playlistmanager’ is not defined
)
[W] unknown:140 - file:///usr/share/harbour-tidalplayer/qml/components/PlaylistManager.qml:140: Error: Cannot assign [undefined] to int
[D] :382 - Tidal module imported successfully
[D] :137 - tidalApi::printConsole Initialise tidal api
[D] :58 - playlistManager::printConsoleInitialise tidal api
[D] loadCurrentPlaylistState:164 - Loading current playlist [object Object]
[D] loadCurrentPlaylistState:165 - Loading current playlist undefined
[D] loadCurrentPlaylistState:166 - Loading current playlist undefined
But please don’t lose time: I thought it was ready to test from Chum but I might have misunderstood.
I rather can read the thread more deeply, instead of losing your time 