Rhino.Inside Revit 2026 assembly conflict

Rhino.Inside Revit
1

Hi there,

We’re having an issue where our Rhino.Inside doesn’t launch in Revit 2026 (it works fine in all our other revits.

It’s definitely a conflict with another add-in, who are a lovely and responsive bunch with whom we’ve ruled out their add-in doing anything untoward.

The issue the journal suggesting is that the current Rhino.Inside is built on the original 2026 build, 2026.0.4.0 rather than the latest 2026.4.0.0

It loads in seemingly ok into revit, (first below) until one tries to launch Rhino, at which point complains it can’t reach the zoo (second below)

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and the Revit journal is showing the below:

Jrn.RibbonEvent “Execute external command:CustomCtrl_%CustomCtrl_%Rhino.Inside%More%CommandStart:RhinoInside.Revit.AddIn.Commands.CommandStart”
’ 1:< API_ERROR { : Assembly version conflict in some references in RhinoInside.Revit.AddIn.dll assembly
'Addin’s module RevitAPIUI of version 26.0.4.0 conflicts with same preloaded module of version 26.4.0.0
'Addin’s module RevitAPI of version 26.0.4.0 conflicts with same preloaded module of version 26.4.0.0 }

Is there any plan to have this updated in an upcoming release?

Many thanks!

Kent

2

Is that plugin ruled out or is it definitely a conflict?

Let’s try uninstalling Rhino.Inside Revit and then reinstalling.

What is your current Rhino.Inside Revit version?

3

Hey, I’m working with Kentburns on this.

I’ve reproduced this problem on various machines, and it’s consistent, even on a VM which had never had Revit or Rhino.Inside before, so I doubt that re-installing would help. But I can try, if you still think it’s worthwhile.

The version of Rhino.Inside Revit is 1.35.9540.6370

As for that plugin being definitely ruled out, they’ve emphasised the effort they’ve gone to, to isolate it and its dependencies from other add-ins, so that’s why we’re focusing on the apparent Revit build discrepancy.

4

yes, please do.

5

Thanks, Japhy. I tried that, but it didn’t make any difference.

6

Hi Japhy, do you have any further advice on this one?

7

Hello :slight_smile: any findings on this? Having similar issues on Revit 25.4.50.35 and Revit 26.4.0.32

8

These version of Revit handle Assembly conflicts much better than Revit 2024. Are you getting any reports we can look at?

Does using the Revit Addin Manager help narrow down the conflict?

9

Hi Japhy!

I did disable all the addins but RiR before running. Also I trie removing them from the AddIn folders but got the same error.

This is what i get on the journal:

'<>
’ 0:< ::101:: Delta VM: Avail -75 → 133880730 MB, Used 870 MB; RAM: Avail -2 → 47022 MB, Used +0 → 1124 MB
’ 0:< GUI Resource Usage GDI: Avail 8738, Used 1262, User: Used 540
'E 07-Jul-2026 09:28:43.911; 0:<
’ [Jrn.ExternalEventExecution] Rvt.Attr.AddInId: d2bf4759-52b7-4d10-a0dc-e6b8a2f250b3 Rvt.Attr.AddInName: Enscape 4.8.0 Rvt.Attr.AddInVersion: 4.8.0.723 Rvt.Attr.ExternalEventName: RevitCadDispatcher Rvt.Attr.VendorDescription: Chaos Software, www.enscape3d.com Rvt.Attr.VendorId: Chaos
'E 07-Jul-2026 09:28:43.926; 0:<
’ [Jrn.ExternalEventExecution] Rvt.Attr.AddInId: 02eff7f0-4921-4fd3-91f6-a87b6ba9bf74 Rvt.Attr.AddInName: Rhino.Inside Rvt.Attr.AddInVersion: 1.32.9327.20567 Rvt.Attr.ExternalEventName: UpdateOpenViewsList Rvt.Attr.VendorDescription: Rhino.Inside®.Revit Rvt.Attr.VendorId: com.mcneel
’ 0:< ::103:: Delta VM: Avail +68 → 133880798 MB, Used +8 → 878 MB, Peak +8 → 879 MB; RAM: Avail -283 → 46739 MB, Used +14 → 1138 MB, Peak +14 → 1138 MB
’ 0:< GUI Resource Usage GDI: Avail 8744, Used 1256, User: Used 540
'E 07-Jul-2026 09:28:53.541; 0:<
Jrn.MouseMove 0 , 585 , 12
'E 07-Jul-2026 09:28:53.542; 0:<
Jrn.RibbonEvent “Execute external command:CustomCtrl_%CustomCtrl_%Rhino.Inside%More%CommandStart:RhinoInside.Revit.AddIn.Commands.CommandStart”
’ 1:< API_ERROR { : Assembly version conflict in some references in RhinoInside.Revit.AddIn.dll assembly
'Addin’s module RevitAPIUI of version 25.0.0.0 conflicts with same preloaded module of version 25.4.50.0
'Addin’s module RevitAPI of version 25.0.0.0 conflicts with same preloaded module of version 25.4.50.0 }

Thank you!

10

This is coming back as an older version, try updating or disabling enscape.

11

Hi,

Thank you for the reply

just tested uninstalling Enscape and still Revit crashes.

'C 07-Jul-2026 13:47:14.405; 0:< Notify Active View.
’ 0:< ::97:: Delta VM: Avail 133880779 MB, Used 860 MB; RAM: Avail -12 → 49508 MB, Used 1112 MB
’ 0:< GUI Resource Usage GDI: Avail 8746, Used 1254, User: Used 540
'E 07-Jul-2026 13:47:14.569; 0:<
Jrn.MouseMove 0 , 663 , 45
'E 07-Jul-2026 13:47:14.569; 0:<
Jrn.RibbonEvent “Execute external command:CustomCtrl_%CustomCtrl_%Rhino.Inside%More%CommandStart:RhinoInside.Revit.AddIn.Commands.CommandStart”
’ 1:< API_ERROR { : Assembly version conflict in some references in RhinoInside.Revit.AddIn.dll assembly
'Addin’s module RevitAPIUI of version 25.0.0.0 conflicts with same preloaded module of version 25.4.50.0
'Addin’s module RevitAPI of version 25.0.0.0 conflicts with same preloaded module of version 25.4.50.0 }

12

Is there an error report generated? To troubleshoot remove any older GH / Rhino plugins as well. Note that Revit 2026 runs in a newer .net version and may have conflicts with old net plugins.