Restoring packages failing with .NET Core 3.0 and Blazor 3.0 preview 9

I am trying to restore a package which should be compatible with the latest Blazor and Core .NET 3.0 but Restoring packages keep failing with the error log in the screenshot above. I have installed additionally .NET frameworks 4.6 to 4.8. I go .NET standard from 1.0 to 2.1, but none of them seems to change the error.

What is the cause of this error and how to fix it ?

Solution

Seems like it was a client side issue. Completely removing the .NET, restart and reinstalling it fix the issue.