Unable to search for packages with the Add window in VS2017 with Nuget 4.2.0

[tanathos]

While I'm using the window to Add a package, whatever I'm searching for I see in the Output Window the following error (this with Automapper, for example):

Ignoring error when requesting 'https://www.nuget.org/api/v2': Request to 'https://api.nuget.org/v3-flatcontainer/?q=Automapper&take=1000' failed with: 'BadRequest'

In my paket.dependencies I've:
source https://www.nuget.org/api/v2

Also the autocomplete in the paket.dependencies throw an error window "Object reference not set to an instance of an object" (but nothing shows up in the Output Window).

Experienced with VS2017 Enterprise and Community Edition 15.2 on solution with .NET 4.6.1 projects.