SOLVE ALL THE ERRORS!

Adding new MVC/Razor items fails throwing an error about hostpolicy.dll

This post was most recently updated on January 23rd, 2022.

< 1 min read.

This article describes how to fix error “There was an error running the selected code generator: ‘Failed to load the dll from \bin\Debug\netcoreapp\win-x86\hostpolicy.dll, HRESULT: 0x800700C1 An error occurred while loading required library hostpolicy.dll'” when you’re adding a new scaffolded item (such as a Razor page or ASP.NET Core MVC Controller) in Visual Studio.

Description

Table of Contents

Imagine this: You’re developing your run-of-the-mill, basic, everyday ASP.NET Core web application. You need to add a new scaffolded item – that is, something like a Razor page or an MVC controller.

How to create a new scaffolded item in ASP.NET Core
How to create a new scaffolded item for ASP.NET Core in Visual Studio

This’ll result in an error somewhat like below:

There was an error running the selected code generator:
'Failed to load the dll from [projectpath]\bin\Debug\netcoreapp\win-x86\hostpolicy.dll, HRESULT: 0x800700C1

An error occurred while loading required library hostpolicy.dll from ...

Solution

We have, in fact, seen this one before! A different context, similar error – so we actually know how to fix it!

For the other post (about a similar error with EF Core), see the post below. Even though it describes a fix to an issue that arises when running Update-Database, the underlying error is in fact the same that causes the error “There was an error running the selected code generator: (HRESULT: 0x800700C1)” for us here.

Essentially – modify your project file to have a RuntimeIdentifiers -node instead of RuntimeIdentifier. See below for more details:

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