Plugin for Revit 2025 could not load the latest Autodesk.Forge package

[ptranU2KHX]

Hi All

Thank you for reading my post. 

I recently upgrade my plugin from net framework to net core to support Revit 2025. However, I experience the issue where Revit could not load the Autodesk.Forge v.1.9.9. The error message is in the illustration below. If I downgrade the version of Autodesk.Forge to v1.9.3, which matches with the one in Revit 2025, it does not show the error but I am not sure if there are any malfunction possibilities since I do not test thoroughly. 

My current plugin with net framework works fine with Autodesk.Forge v1.9.9 for Revit 2023 and Revit 2024. Since my plugin targets multi version of Revit, I am trying to use the same version of Autodesk.Forge for all versions.

Please help.

[jeremy_tammik]

I do not know what this Autodesk.Forge package that you mention might be. What does it do, and who created it? You ought to contact them for help and support. At first glance, I rather doubt that it has anything to do with Autodesk, in spite of the (intentionally?) confusing name.

[ptranU2KHX]

Hi @jeremy_tammik ,

Somehow Revit 2025 does have Autodesk.Forge.dll embedded. It is found as Autodesk\Revit 2025\AddIns\Lightbox\Autodesk.Forge.dll.

So I think it belongs to Autodesk, doesn't it? Here is the github page of it: https://github.com/Autodesk-Forge/forge-api-dotnet-client

[jeremy_tammik]

Aha. Yes, indeed, that is a sample application provided two years ago by Autodesk to work with APS (formerly Forge). Please read the notes in the GitHub repository that you point out:

> This repository has been deprecated. For the new APS SDK for .NET please refer to
https://github.com/autodesk-platform-services/aps-sdk-net.

[ricaun]

I have a issue with 'Autodesk.Forge' recently with version 1.9.8, I believe uses the authentication v1 that is obsolete. Update to version 1.9.9 fix the issue.

• https://github.com/ricaun-io/forge-api-dotnet-oss/issues/6

In the end is better to migrate to the new aps-sdk-net, or create your own implementation to run inside Revit with only the features and dependencies you need.

What kinda of thinks you are using inside Revit with APS/Forge?

[ptranU2KHX]

Thanks @jeremy_tammik. It makes sense to me now

---

@jeremy_tammik wrote:

Aha. Yes, indeed, that is a sample application provided two years ago by Autodesk to work with APS (formerly Forge). Please read the notes in the GitHub repository that you point out:

> This repository has been deprecated. For the new APS SDK for .NET please refer to
https://github.com/autodesk-platform-services/aps-sdk-net.

---

[ptranU2KHX]

Thanks @ricaun . Currently, I currently use Autodesk.Forge package for converting the response from APS to their model types, such as hub, project, folder.

[cwangCJ7J2]

Hey @ptranU2KHX, I got exactly the same issue as you posted. Do you have a solution? Thanks!

[ptranU2KHX · Accepted solution]

Hey @cwangCJ7J2 , just simply roll back to v1.9.3. It works for Revit 2025.

[cwangCJ7J2]

It works! Thank you! I was trying to debug it, but I found that Autodesk has archived the repository. I'm thinking of starting a new .NET client repo since we are working on building many Revit tools with APS connection internally.

[ptranU2KHX]

Glad it helps!

Autodesk has introduced new SDK for APS. You might want to start to look at it before starting a new one.

[mari.shimode]

Hi @ptranU2KHX, thank you for sharing the solution! I have marked it as an accepted solution so people who have the same question can find it easily in the fuutre.

@cwangCJ7J2, thank you for validating. I'm glad to hear your issue has been resolved.