Cannot enable migrations in VS.2017 with ASP.NET Core web application

I started to build my ASP.NET web application with the ASP.NET Core template. I noticed it has already two files in the ~\Data\Migrations folder one naemd *_CreateIdentitySchema.cs and the other ApplicationDbContextModelSnapshot.

At first it was complaining that i had Powershell 2 so I installed v3. Then I installed the package EntityFramework (v6.1.3) from the package manager because somehow that was not installed from the template as it was the case in VS.2015.

Now it gives me an error like "Exception calling "SetData" with "2" argument(s): " and then a bunch of things.

 $domain.SetData('contextProject', $contextProject)
 CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
  FullyQualifiedErrorId : SerializationException
 Exception calling "SetData" with "2" argument(s): "Type 'Microsoft.VisualStudio.ProjectSystem.VS.Implementation.Package.Automation.OAProject' in assembly 'Microsoft.VisualStudio.ProjectSystem.VS.Implementation, 

Version=15.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable." At C:\Users\Devel.nuget\packages\entityframework\6.1.3\tools\EntityFramework.psm1:720 char:5 + $domain.SetData('startUpProject', $startUpProject)

I am using VS.2017 Update 1, I get the impression this "core" thing is complicating life more than making it simpler.