NuGet Package restore failed for project Miscellaneous Files: Value cannot be null or an empty string. Parameter name: root. 0 0

Question

I have such error in vs 2012: NuGet Package restore failed for project Miscellaneous Files: Value cannot be null or an empty string. Parameter name: root. 0 0

I see

Answer 1

In Visual Studio 2015:

Go to Options->NuGet Package Manager-> Package Sources, make sure "Microsoft and .Net" is checked in the Machine-wide package list.