Spotify problem - spop plugin

Hello,
Today no spotify functions are successful : Can’t play playlists and when I try to search artist, I get nothing.
Found these three lines in volumio.log :
2020-02-05T11:36:57.571Z - info: CoreCommandRouter::executeOnPlugin: spop , handleBrowseUri
2020-02-05T11:37:03.846Z - info: CoreCommandRouter::executeOnPlugin: spop , search
2020-02-05T11:37:03.909Z - info: An error occurred while searching WebapiError: Unauthorized
Is there another log (where ?) giving more informations ?
Does anyone have an idea ?
Thnks,
Eric