"GH - Missing Definition Objects" Error in Rhino.Compute local server

Rhino Developer compute.rhino3d
1

Problem Description:

I am running a local Rhino.Compute server (compute.geometry) on my machine by cloning the GitHub repository “compute.rhino3d” with the branch 8x and then running the compute.geometry through Visual Basic debugging like this.

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When I execute a Grasshopper script that does not use any external plugins, it runs perfectly and returns the expected response.
However, when I try running a Grasshopper script that includes an external plugin like Pufferfish, I get the following error in the Compute.Geometry logs:

CG  [16:41:23 DBG] Received a HTTP POST request to the /grasshopper endpoint
CG  [16:41:23 ERR] An exception occurred while processing request  
System.Exception: GH - Missing Definition Objects

Despite this error, Compute.Geometry logs show that Pufferfish is being loaded when the server starts:

CG  [16:55:11 DBG] Logging to C:\Users\Administrator\AppData\Local\Temp\Compute\Logs
CG  [16:55:11 INF] Child process started at 3/3/2025 4:55:11 PM
CG  [16:55:12 INF] Compute 8.0.0.0, Rhino 8.15.25019.13001
CG  [16:55:12 DBG] Rhino system directory: C:\Program Files\Rhino 8\System
CG  [16:55:16 DBG] Hosting starting
CG  [16:55:23 INF] (1/4) Loading rhino commands plugin
CG  [16:55:23 INF] Successfully loaded commands plugin
CG  [16:55:23 INF] (2/4) Loading rhino scripting plugin
CG  [16:55:24 INF] Successfully loaded scripting plugin
CG  [16:55:24 INF] Configured scripting plugin for compute
CG  [16:55:24 INF] (3/4) Loading grasshopper
Grasshopper has started loading all component libraries
* Loading Grasshopper core assembly...
* Loading CurveComponents assembly...
* Loading FieldComponents assembly...
* Loading GalapagosComponents assembly...
* Loading IOComponents assembly...
* Loading Kangaroo2Component assembly...
* Loading MathComponents assembly...
* Loading RhinoCodePluginGH assembly...
* Loading ScriptComponents assembly...
* Loading SurfaceComponents assembly...
* Loading TriangulationComponents assembly...
* Loading VectorComponents assembly...
* Loading XformComponents assembly...
* Loading Pufferfish3-0 assembly...
* Loading BitmapComponent assembly...
* Loading GrasshopperHyperGooComponents assembly...
* Loading ShapeDiverSquid assembly...
* Loading Hops assembly...
* Loading GhPython assembly...
CG  [16:55:36 INF] (4/4) Loading compute plug-ins
CG  [16:55:37 DBG] Found module compute.geometry.FixedEndPointsModule
CG  [16:55:37 DBG] Found module compute.geometry.RhinoGetModule
CG  [16:55:37 DBG] Found module compute.geometry.RhinoPostModule
CG  [16:55:37 DBG] Found module compute.geometry.ResthopperEndpointsModule
CG  [16:55:37 INF] Now listening on: http://localhost:5000
CG  [16:55:37 INF] Application started. Press Ctrl+C to shut down.
CG  [16:55:37 INF] Hosting environment: Production
CG  [16:55:37 INF] Content root path: C:\Users\Abhay sharma\Downloads\compute.rhino3d-8.x\compute.rhino3d-8.x\src\bin\Debug\compute.geometry
CG  [16:55:37 DBG] Hosting started

Steps I Have Tried:

  1. Ensured Pufferfish is installed in C:\Users<Username>\AppData\Roaming\Grasshopper\Libraries.
  2. Unblocked the Pufferfish.gha file.
  3. Confirmed that Pufferfish works inside Grasshopper (manually tested components inside Rhino).
  4. Tried running Compute.Geometry as Administrator to avoid permission issues.
  5. Set the plugin path explicitly before running Compute.Geometry
  6. Checked if Grasshopper shows errors when loading Pufferfish—no issues found.
  7. Expanded all clusters in my .gh script to ensure Compute.Geometry can recognize the components.
  8. Checked Rhino and Pufferfish versions for compatibility (I’m using Rhino 8).

System Details:

  • Rhino Version: Rhino 8.15.25019.13001
  • Compute.Geometry Version: 8.0.0.0
  • Pufferfish Version: 3.0
  • OS: Windows

Questions:

  1. Why is Compute.Geometry failing to find Pufferfish components in my script, even though it appears to load successfully?
  2. Are there additional steps required to make external plugins work with Compute.Geometry?
  3. Has anyone successfully used Pufferfish with Rhino.Compute? If so, what setup worked for you?

Any insights would be greatly appreciated! :rocket:

2

Hi @AndyPayne,

We are getting this error when trying to run external plugins on rhino compute on local server as well as VM. Could you please help us identify the problem?

Thanks in advance!

Tarang

3

@Abhay_Sharma Are you sure this error is referring to the Pufferfish plugin? The error message doesn’t really say which missing object. You can double check that the Pufferfish plugin is being loaded if you hit the endpoint /plugins/gh/installed.