Unknown Command error in AutoCAD 2025 after .Net migration to 8.0(core).

[pts_user]

Hi All,

I am currently migrating an external 3D PDF plug-in from 2024 to 2025. The plugin loads onto the AutoCAD 2024 as well as the AutoCAD 2025 and also shows up on the Ribbon Bar. The challenge that I am facing is that the 2024 version correctly functions with the plugin but for the 2025 version it shows an Unknown command error while clicking on the plugin.

Info:

Project Developed in Visual Studio 2022

C# .NET core 8.0 Utilized

I have tried:
Changing PackageContent.xml to match the correct series which is "r25.0"

Making sure all references are copy local = false

Making sure all references point to the correct folder of AutoCAD 2025 and also made sure that the module name is pointing to the correct dll location.

Verifying the plugin bundle was put in the test users C:/Program Files/Autodesk/ApplicationPlugins folder.

Added the appropriate Nudget packages to the project(AutoCAD.NET and AutoCAD.NET.Model).

Upgraded the project to .net 8.0 using the Visual Studio upgrade assistant.

Please let me know why there may be a discrepancy between systems when utilizing this plugin.

[serbestcihangir]

Hi,

I have similer problem with my plugin. After upgrading the plugin to .NET 8.0 for AutoCAD 2025, it is not work with AutoCAD 2024 and lower versions, anymore. Does anyone have any idea about this issue?

[Ed__Jobe · Accepted solution]

You can't use the same dll for both versions. For versions prior to 2025, the project needs to target .NET Framework 4.8. You should read this blog post.

[Ed__Jobe]

I hope you kept a backup of your 4.8 project before you upgraded to core 8.

[serbestcihangir]

Kindly, thank you for your quick reply and help. Yes, I keep the main code always, before any changes. 

[Ed__Jobe]

If you want to delete a post, don't just delete the text. Use the Report button and ask the moderator to delete it. 😁

[serbestcihangir]

Thank you. I was trying to delete my previous post that sent to wrong user. 😁 I deleted the text because I couldn't find any button for deleting. 

[serbestcihangir]

Just another question: I can't see ACCEPT SOLUTION button on your post to accept post as solution.

[Ed__Jobe]

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@serbestcihangir wrote:
Just another question: I can't see ACCEPT SOLUTION button on your post to accept post as solution.

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The forums seem to be having problems this morning. I clicked it for you.