EF 7 Beta 8 - > EF7 RC1 - 移行を作成できなくなる

既存のプロジェクトをベータ8からRC1に変更しようとすると、 dnx ef migrations add Init実行した後で次のようになりますdnx ef migrations add Init

System.TypeLoadException: Could not load type 'Microsoft.Data.Entity.Scaffolding.SqliteDesignTimeServices, EntityFramework.Sqlite.Design'.
  at Microsoft.Data.Entity.Design.Internal.DesignTimeServicesBuilder.ConfigureProviderServices (System.String provider, IServiceCollection services, Boolean throwOnError) [0x00000] in <filename unknown>:0 
  at Microsoft.Data.Entity.Design.Internal.DesignTimeServicesBuilder.Build (Microsoft.Data.Entity.DbContext context) [0x00000] in <filename unknown>:0 
  at Microsoft.Data.Entity.Design.MigrationsOperations.AddMigration (System.String name, System.String outputDir, System.String contextType) [0x00000] in <filename unknown>:0 
  at Microsoft.Data.Entity.Commands.Program+Executor+<>c__DisplayClass6_0.<AddMigration>b__0 () [0x00000] in <filename unknown>:0 
  at Microsoft.Data.Entity.Commands.Program+Executor.Execute (System.Action action) [0x00000] in <filename unknown>:0 
Could not load type 'Microsoft.Data.Entity.Scaffolding.SqliteDesignTimeServices, EntityFramework.Sqlite.Design'.

私のproject.jsonファイルには、他の人たちと共に以下のものが含まれています

"dependencies": {
  "EntityFramework.Commands": "7.0.0-rc1-final",
  "EntityFramework.SQLite": "7.0.0-rc1-final"
},
"commands": {
  "ef": "EntityFramework.Commands"
},

このエラーを解決するには何が必要ですか？