Failed to create deps.json to enable migration

Question

I am using asp.net core mvc for web development. I want to enable entity migration through the Entity Framework Core.NET Command Line tools:

dotnet ef migrations add InitialDatabase

but an error occurs: it was not possible to generate deps.json, it may already have been generated: C: \ Program Files \ dotnet \ sdk \ 2.0.2 \ Sdks \ Microsoft.NET.Sdk \ build \ GenerateDeps \ GenerateDeps.proj

Are there any .NET Core configurations I missed?