Issue Loading Add-In in Revit 2025.3 VSC-22 PART.2

[Storm_Clayton]

Hi Jeremy,

I hope you're doing well. I wanted to check if you could assist me again with the issue you mentioned regarding the title: "Issue Loading Add-In in Revit 2025.3 VSC-22."
I really appreciate your help and guidance. Looking forward to your response!

Best regards,

[moturi.magati.george]

Hi @Storm_Clayton,

Kindly describe the issue you are facing to enable us to help you.
Share the error is possible

[Storm_Clayton]

Hello everyone,

I am currently facing a compilation issue with my .DLL file for Autodesk Revit 2025. Despite following the official documentation and relevant examples, I am encountering errors during the build process. Notably, this issue did not occur in previous versions of the product.

Here are the specifics of my setup:

• Development Environment: Visual Studio Community
• Revit Version: 2025.3
• Error Messages: "You cannot directly start a project with a class library output type. To debug this project, you need to add an executable solution that references the class library project. Set the executable project as the startup project."

[Storm_Clayton]

https://forums.autodesk.com/t5/revit-api-forum/compilation-issue-with-dll-for-autodesk-revit-2025/m-...

[sragan]

Maybe this is what Jeremy was reffering to:

Solved: Re: Debug Revit 2025 pluggin on visual studio 2025. - Autodesk Community - Revit Products