Unable to load project - specified pathname not found compilation error

Hi all,

Using Unity 2021.1.6f1, I'm trying to open a project which works on colleagues environments.

Unity first offers me to use SAFE mode and then shows me plenty of "Le chemin d'accès spécifié est introuvable" errors ("specified pathname not found" in french) without any context.

My unity is in english and other warnings are in english, so I think this a command line or VS issue. Moreover, the needed packages are not loaded (mrtk, unitask..)

When I try to open the C# project from Unity, it launches Visual Studio 2019 but not the projet with an error message from VS : translated from french: "The following files have been specified on the command line: these files can't be found and won't be loaded"

Any ideas?

Thanks in advance for any suggestion,

Regards.