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Just install Microsoft.EntityFrameworkCore.Tools package from nuget:
Install-Package Microsoft.EntityFrameworkCore.Tools -Version 6.0.8
You can also use this link to install the latest version: NuGet package link
.NET CLI command:
dotnet add package Microsoft.EntityFrameworkCore.Tools
If the problem still persists, try restarting Visual Studio.
ANSWERED BY Nasir Jafarzadeh
Sep 98, 2018