'The type or namespace name 'Mvc' does not exist in the namespace 'System.Web' .NET MVC 5 to .NET Core 3.1 MVC Migration

I have almost completed my migration from ASP.NET MVC 5 to .NET Core 3.1 and I am getting this error,

The type or namespace name 'Mvc' does not exist in the namespace 'System.Web' (are you missing an assemble reference?).

The error is occurring in my /Views/Shared/Error.cshtml view, where I am setting the model.

@model System.Web.Mvc.HandleErrorInfo

@{
    ViewBag.Title = "Error"
}

<h1 class="text-danger">Error.</h1>
<h2 class="text-danger">An error occurred while processing your request.</h2>

I have removed all of the AspNetCore packages and re-added them, and I have tried restarting my Visual Studio (VS19), all to no avail.

Perhaps the error handling has been moved out of the MVC package in .NET Core? That’s my best guess.

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'The type or namespace name 'Mvc' does not exist in the namespace 'System.Web' .NET MVC 5 to .NET Core 3.1 MVC Migration

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