Enable Migrations Error

Question

Enable Migrations Error

When trying to use Code First Migrations, the following error is occurring. Any ideas?

PM> enable-migrations
Exception calling "LoadFrom" with "1" argument(s): "Could not load file or assembly 'file:///C:\Users\User1\Documents\Visual Studio 2013\
WebSites\Website1\C#\packages\EntityFramework.6.1.1\tools\Entity
Framework.PowerShell.Utility.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)"
At C:\Users\User1\Documents\Visual Studio 2013\WebSites\Website1\C#\
packages\EntityFramework.6.1.1\tools\EntityFramework.psm1:780 char:62
+     $utilityAssembly = [System.Reflection.Assembly]::LoadFrom <<<< ((Join-Path $ToolsPath EntityFramework.PowerShell.Utility.dll))
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

You cannot call a method on a null-valued expression.
At C:\Users\User1\Documents\Visual Studio 2013\WebSites\Website1\C#\
packages\EntityFramework.6.1.1\tools\EntityFramework.psm1:781 char:50
+     $dispatcher = $utilityAssembly.CreateInstance <<<< (
    + CategoryInfo          : InvalidOperation: (CreateInstance:String) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull

Exception calling "CreateInstanceFrom" with "8" argument(s): "Could not load file or assembly 'file:///C:\Users\User1\Documents\Visual St
udio 2013\WebSites\Website1\C#\packages\EntityFramework.6.1.1\to
ols\EntityFramework.PowerShell.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)"
At C:\Users\User1\Documents\Visual Studio 2013\WebSites\Website1\C#\
packages\EntityFramework.6.1.1\tools\EntityFramework.psm1:809 char:31
+     $domain.CreateInstanceFrom <<<< (
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

PM>

asp.net

asked on Stack Overflow Nov 12, 2015 by

Mike • edited Nov 12, 2015 by

Tgsmith61591

3 Answers

This has happened to me before, uninstalling and reinstalling Entity framework solved the issue.

Another time I had to reinstall and then close and re-open visual studio in order for it to work.

answered on Stack Overflow Nov 12, 2015 by

UnitStack

This issue will occur if you dont have entity framework installed. Follow the below steps

Step1: Install the entity framework by going in to tools > NugetPackage manager > package manager console

Install-Package EntityFramework -IncludePrerelease

Step2: create a new class anywhere- later we can remove it

  public class MyDbContext : DbContext
    {
        public MyDbContext()
        {

        }
    }

Note: After DbContext use Shortcut {Alt / ctrl }. {ENTER} to ad Using Statement (using System.Data.Entity)

If we don't do this we will get another error:

No context type was found in the assembly

Then run the following command

enable-migrations

It should work.

answered on Stack Overflow Oct 30, 2018 by

Ragavan Rajan

Try running the following steps-

enable-migrations
add-migration "Give a name for the migration"
update-database

If these steps do not work, you may need to download NuGet Packages

answered on Stack Overflow Sep 17, 2019 by

Thiren Naidoo • edited Sep 17, 2019 by

Dharman

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