(VS2017) There was an error running the selected code generator: 'Sequence contains no elements'

Question

I'm running through one of Microsoft's tutorials on MVC development and I'm getting errors when trying to create various elements; Views, Controllers, etc.

The error I'm getting is the following:

There was an error running the selected code generator: 
'Sequence contains no elements'

It's consistant everytime I try to create a new element. Earlier, I bypassed the error by copying a view and repurposing it. But that's not optimal in the long run!

I'm currently sitting at work doing this tutorial where the issues arise. However, when I started this tutorial at home yesterday (hence, on a different network) I had zero issues. Might that have something to say?

Here's a link to the project on GitHub.

Do you think it's an issues with my network, my project itself, or something completely different?

Answer 1

To anyone seeing this error when attempting to scaffold an upgraded .net6 project.

• Scaffolds only work with the new style .net6 Minimal Hosting Model and I still had the .net5 style program and startup files.

This moved me next onto a frustrating EF Core issue 'unable to resolve service' error meaning Scaffold was unable to resolve the EF Contexts despite them being correctly in the new program.cs

• Created a IDesignTimeDbContextFactory for Scaffold to detect the Context types.

Answer 2

Visual Studio 2019 and .net core 3.0

Uninstalled: Microsoft.VisualStudio.Web.CodeGeneration.Design Version: 3.1.0-preview3.19558.8

and Installed: Microsoft.VisualStudio.Web.CodeGeneration.Design Version: 3.0.0

Solved the issue for me.