Not found Sql.MigrationSqlGenerator.set_ProviderManifest

I first use the framework 6 entity code, and when I try to execute the Update-database command , I get a message:

Method not found: "Void System.Data.Entity.Migrations.Sql.MigrationSqlGenerator.set_ProviderManifest (System.Data.Entity.Core.Common.DbProviderManifest).

thanks for any help

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I finally decided it at my end. I used Entity Framework 6.0.2 (the latter), which obviously has this error.

Reinstalling the package did not help, but it happened:

Install-Package EntityFramework -Pre 

, - (6.1) Entity Framework, . , , , .

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