'Entity Framework 5 or later is required for the current operation but not available. Make sure the project has a reference to Entity Framework version 5 or greater.'

Question

The Error Message (for indexing)
There was an error running the selected code generator:
'Entity Framework 5 or later is required for the current operation but not available. Make sure the project has a reference to Entity Framework version 5 or greater.'

Same problem for Core or ASP.NET

Create a new MVC site
Connect to SQL Server Database
Create Model (with all tables/views) (Models -> Right Click -> Add -> New ADO.NET Entity Model -> Code First from Database
Pick a database -> Select all tables and views ->Finish
Zero problems recorded, Hit Build Note my References: packages.config

OK, now try to scaffold one table.

Controllers -> Right click -> Add -> Controller.
MVC5 Controller with views, using Entity Framework

Then this:

Now notice the packages.config:

The scaffolding fails, no controllers or views are created, Entity Framework has been DOWNGRADED from 6.2.0 to 6.1.3 AND I get 47 of these when I try to build...

Severity	Code	Description	Project	File	Line	Suppression State  
Error	CS0234	The type or namespace name 'Entity' does not exist in the namespace 'System.Data' (are you missing an assembly reference?)	MVCWizardFail	C:\Users\Bryan Valencia\Documents\Projects\MVCWizardFail\MVCWizardFail\Models\ORM.cs	3	Active

Any ideas about how to restore this once amazing functionality - or am I condemned to hand code pages for 47x5 views?

Here is my Help/About info...

Microsoft Visual Studio Professional 2019 (2)  
Version 16.10.2  
VisualStudio.16.Release/16.10.2+31410.357  
Microsoft .NET Framework  
Version 4.8.04084  
  
Installed Version: Professional  
  
Visual C++ 2019   00435-20150-07940-AA398  
Microsoft Visual C++ 2019  
  
ADL Tools Service Provider   1.0  
This package contains services used by Data Lake tools  
  
ASA Service Provider   1.0  
  
ASP.NET and Web Tools 2019   16.10.526.50910  
ASP.NET and Web Tools 2019  
  
ASP.NET Web Frameworks and Tools 2019   16.10.526.50910  
For additional information, visit https://www.asp.net/  
  
Azure App Service Tools v3.0.0   16.10.526.50910  
Azure App Service Tools v3.0.0  
  
Azure Data Lake Node   1.0  
This package contains the Data Lake integration nodes for Server Explorer.  
  
Azure Data Lake Tools for Visual Studio   2.6.1000.0  
Microsoft Azure Data Lake Tools for Visual Studio  
  
Azure Functions and Web Jobs Tools   16.10.526.50910  
Azure Functions and Web Jobs Tools  
  
Azure Stream Analytics Tools for Visual Studio   2.6.1000.0  
Microsoft Azure Stream Analytics Tools for Visual Studio  
  
C# Tools   3.10.0-4.21269.26+029847714208ebe49668667c60ea5b0a294e0fcb  
C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.  
  
Common Azure Tools   1.10  
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.  
  
Extensibility Message Bus   1.2.6 (master@34d6af2)  
Provides common messaging-based MEF services for loosely coupled Visual Studio extension components communication and integration.  
  
Fabric.DiagnosticEvents   1.0  
Fabric Diagnostic Events  
  
Microsoft Azure HDInsight Azure Node   2.6.1000.0  
HDInsight Node under Azure Node  
  
Microsoft Azure Hive Query Language Service   2.6.1000.0  
Language service for Hive query  
  
Microsoft Azure Service Fabric Tools for Visual Studio   16.10  
Microsoft Azure Service Fabric Tools for Visual Studio  
  
Microsoft Azure Stream Analytics Language Service   2.6.1000.0  
Language service for Azure Stream Analytics  
  
Microsoft Azure Stream Analytics Node   1.0  
Azure Stream Analytics Node under Azure Node  
  
Microsoft Azure Tools   2.9  
Microsoft Azure Tools for Microsoft Visual Studio 2019 - v2.9.40423.1  
  
Microsoft Continuous Delivery Tools for Visual Studio   0.4  
Simplifying the configuration of Azure DevOps pipelines from within the Visual Studio IDE.  
  
Microsoft JVM Debugger   1.0  
Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines  
  
Microsoft Library Manager   2.1.113+g422d40002e.RR  
Install client-side libraries easily to any web project  
  
Microsoft MI-Based Debugger   1.0  
Provides support for connecting Visual Studio to MI compatible debuggers  
  
Microsoft Visual C++ Wizards   1.0  
Microsoft Visual C++ Wizards  
  
Microsoft Visual Studio Tools for Containers   1.2  
Develop, run, validate your ASP.NET Core applications in the target environment. F5 your application directly into a container with debugging, or CTRL + F5 to edit & refresh your app without having to rebuild the container.  
  
Microsoft Visual Studio VC Package   1.0  
Microsoft Visual Studio VC Package  
  
Mono Debugging for Visual Studio   16.10.15 (552afdf)  
Support for debugging Mono processes with Visual Studio.  
  
Node.js Tools   1.5.30310.1 Commit Hash:e550dd1b679956810ccace4368dbc7a64443213b  
Adds support for developing and debugging Node.js apps in Visual Studio  
  
NuGet Package Manager   5.10.0  
NuGet Package Manager in Visual Studio. For more information about NuGet, visit https://docs.nuget.org/  
  
ProjectServicesPackage Extension   1.0  
ProjectServicesPackage Visual Studio Extension Detailed Info  
  
Razor (ASP.NET Core)   16.1.0.2122504+13c05c96ea6bdbe550bd88b0bf6cdddf8cde1725  
Provides languages services for ASP.NET Core Razor.  
  
SQL Server Data Tools   16.0.62105.04180  
Microsoft SQL Server Data Tools  
  
SQL Server Reporting Services   15.0.19528.0  
Microsoft SQL Server Reporting Services Designers   
Version 15.0.19528.0  
  
ToolWindowHostedEditor   1.0  
Hosting json editor into a tool window  
  
TypeScript Tools   16.0.30429.2002  
TypeScript Tools for Microsoft Visual Studio  
  
Visual Basic Tools   3.10.0-4.21269.26+029847714208ebe49668667c60ea5b0a294e0fcb  
Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.  
  
Visual F# Tools   16.10.0-beta.21262.7+1b23bbeda88ea3cb9be9af777f4c99fa8663df81  
Microsoft Visual F# Tools  
  
Visual Studio Code Debug Adapter Host Package   1.0  
Interop layer for hosting Visual Studio Code debug adapters in Visual Studio  
  
Visual Studio Container Tools Extensions   1.0  
View, manage, and diagnose containers within Visual Studio.  
  
Visual Studio Tools for Containers   1.0  
Visual Studio Tools for Containers  
  
Visual Studio Tools for Kubernetes   1.0  
Visual Studio Tools for Kubernetes  
  
Visual Studio Tools for Unity   4.10.3.0  
Visual Studio Tools for Unity  
  
VisualStudio.DeviceLog   1.0  
Information about my package  
  
VisualStudio.Foo   1.0  
Information about my package  
  
VisualStudio.Mac   1.0  
Mac Extension for Visual Studio  
  
Xamarin   16.10.000.231 (d16-10@8111164)  
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.  
  
Xamarin Designer   16.10.0.115 (remotes/origin/c750fbf1bde3c720d077f51640fe197c6dac7cbe@c750fbf1b)  
Visual Studio extension to enable Xamarin Designer tools in Visual Studio.  
  
Xamarin Templates   16.10.5 (355b57a)  
Templates for building iOS, Android, and Windows apps with Xamarin and Xamarin.Forms.  
  
Xamarin.Android SDK   11.3.0.4 (d16-10/ae14caf)  
Xamarin.Android Reference Assemblies and MSBuild support.  
    Mono: b4a3858  
    Java.Interop: xamarin/java.interop/d16-10@f39db25  
    ProGuard: Guardsquare/proguard/v7.0.1@912d149  
    SQLite: xamarin/sqlite/3.35.4@85460d3  
    Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-10@c5732a0  
  
  
Xamarin.iOS and Xamarin.Mac SDK   14.20.0.10 (0e35b2e0b)  
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.

Answer

Hi @Bryan Valencia ,
I suggest you could uninstall and reinstall EF6. And then you need to migrate your codes from EF5 to EF6.

Install the EF6 NuGet package
Ensure that assembly references to System.Data.Entity.dll are removed
Swap any EF Designer (EDMX) models to use EF 6.x code generation
Update namespaces for any core EF types being used

More details,you could refer to below article:
https://learn.microsoft.com/en-us/ef/ef6/what-is-new/upgrading-to-ef6
Best regards,
Yijing Sun

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Answer

See this https://youtu.be/IwioQ1ynsPg

Answer

I have asked repeatedly on this forum, either how to make this "code generator" work, update it, it write my own. Sadly I can find NO DOCUMENTATION on how to do ANY of this.

'Entity Framework 5 or later is required for the current operation but not available. Make sure the project has a reference to Entity Framework version 5 or greater.'

3 answers