Erro no primeiro Add-Migration

PM> Add-Migration Unidade

PM> Add-Migration Unidade System.MissingMethodException: Method not found: 'Void Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommandBuilderFactory..ctor(Microsoft.EntityFrameworkCore.Diagnostics.IDiagnosticsLogger1<Command>, Microsoft.EntityFrameworkCore.Storage.IRelationalTypeMapper)'. at MySql.Data.EntityFrameworkCore.Storage.Internal.MySQLCommandBuilderFactory..ctor(IDiagnosticsLogger1 logger, IRelationalTypeMapper typeMapper) --- End of stack trace from previous location where exception was thrown --- (...) (...)

(No final em vermelho...)

Method not found: 'Void Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommandBuilderFactory..ctor(Microsoft.EntityFrameworkCore.Diagnostics.IDiagnosticsLogger`1, Microsoft.EntityFrameworkCore.Storage.IRelationalTypeMapper)'.

Estou utilizando o pacote Microsoft.EntityFrameworkCore.Tools 2.1.2 do NuGet. Windows 10 Visual Studio 2017 - Enterprise

PM> Get-Package

Id Versions ProjectName

MySql.Data {8.0.12} EF_CRUDMicrosoft.EntityFrameworkCore.Tools {2.1.2} EF_CRUDMicrosoft.NETCore.App {2.1} EF_CRUDMySql.Data.EntityFrameworkCore {8.0.12} EF_CRUD