Error adding migrations: Failed to create CoreCLR, HRESULT: 0x80070057

Question

Error adding migrations: Failed to create CoreCLR, HRESULT: 0x80070057

SoggyBottomBoy 6

I'm having an issue whereby I get the error message: Failed to create CoreCLR, HRESULT: 0x80070057 when I use any of the entity framework tooling.

I have 2 projects in my solution an ASP.NET Core (.NET 5) Web API and a .NET Standard 2.0 Class Library.

My intention is that my class library would contain the Models so that I can re-use these same models client side (and in a VSTO app which is .NET Framework 4.7.2). I'm stuck with .NET standard for the moment and can't move to .NET 5

It appears that the root cause of the issue is adding a project reference to the class library. Even with my models being stored in my ASP.NET project and me not referencing the class library with a using statement just having it as a reference results in the error. As soon as I remove the reference to my class library I have no problems... is there something I am missing?

SoggyBottomBoy 6 Reputation points

2021-01-16T05:36:04.207+00:00

I have also checked in changing my class library to a .NET Core 3.1 library would resolve my issue and it does not.
Rena Ni - MSFT 2,066 Reputation points

2021-01-18T08:30:24.573+00:00

Hi @SoggyBottomBoy ,What about migrating your class library to .Net 5?
SoggyBottomBoy 6 Reputation points

2021-01-19T19:41:59.927+00:00

@Rena Ni - MSFT I can not migrate to .NET 5 as I have a VSTO framework 4.7.2 project. VSTO does not have a .NET Core/.NET 5 implementation.
Rena Ni - MSFT 2,066 Reputation points

2021-01-20T08:06:46.907+00:00

Hi @SoggyBottomBoy ,which ef core tool you use?And where did you use it?Also you use a VSTO app which is .NET Framework 4.7.2,why not using class library which is .NET Framework?