I’ve tried to find more information on this topic here but have had trouble getting a clear answer. I’m using a Heron component in one of my Grasshopper definitions to do a coordinate transformation and I’ve created a Hops for that definition, but I get the error “Object reference not set to an inst…

[image] Heron plugin in rhino appserver compute.rhino3d Hi Aidan, The DD to XY component needs to reference the Rhino Doc’s EarthAnchorPoint in order to convert a lat/lon coordinate to a point in the model–and therefore cannot work in a headless environment. …

Are you running rhino.compute locally? Or is you rhino.compute on a VM? It’s possible that your plugin isn’t being loaded. You can hit the endpoint /plugins/gh/installed and it will return a list of the plugins which rhino.compute has installed.

I am running locally at the moment. This is the result of hitting that endpoint. I will reach out to the Heron dev. Perhaps it is incompatible. Thanks again, Andy. {"Heron":"0.4.4","Hops":"0.16.27","Human":"1.3.1","jSwan":"1.2.1","Mesh Pipe":"1.0.0.0","MeshEdit Components":"2.0.0.0","Pufferfish":"3…

Is it possible to share the definition that you’re using so I can test on my machine? Thanks.

It is and but I’ll save your time for now unless it becomes a major issue. I’ll see what the developer gets back with. In the meantime I replaced the node with some vanilla Grasshopper instead. Thanks, Andy.

Hi Andy! I will take you up on that offer since I seem to be having the same problem with both Pufferfish as well as the Speckle Plugin. When using both of those in my script and loading the script via rhino.compute I get the error “Object reference not set to an instance of an object”. I’ve attache…

Hi Andy! I did some more debugging this week weekend. Some of those issues appear to be related to incompatible plugins. I’ve removed as many of those as I could and gone with alternatives that work or vanilla Grasshopper. These are my errors now (screenshot attached). I’ve also included my updated …

I figured out the event watcher error. It just had to do with the Read File node not being supported. I was using internalized data in the Read File node as a default value. Then I’ve just removed Speckle from the process for now and I’ve asked their team if they understand why those errors might be…

Hi Aidan. This is difficult for me to troubleshoot because I don’t currently have the Speckle plugin installed (but I can try to do this if necessary). But, you also haven’t attached all of the referenced files that I would need in order to test this. I see there are links to the speckle system and …

Hi Andy, don’t worry about it. I don’t need to use Speckle and have found a vanilla Grasshopper workaround. I thought I had internalized that data in the .gh file but it must not have worked. All good for now though.

Using Grasshopper plugins in Hops with rhino.compute

Rhino Developer compute.rhino3d

aidan.newsome (Aidan Newsome) November 6, 2025, 7:27pm 6

Topic		Replies	Views
How to run a grasshopper definition from rhino compute with hops? compute.rhino3d windows , hops	12	569	December 16, 2025
Grasshopper plugins not working in Rhino.compute but working in Rhino GUI compute.rhino3d windows , mac , plugin , grasshopperrhino , rhinocompute	0	106	August 10, 2025
Rhino 7 compute Grasshopper compute.rhino3d windows	1	733	August 3, 2021
Rhino compute not showing all installed plugins compute.rhino3d windows	4	522	June 18, 2024
Rhino Compute + appserver: Internal Server Error compute.rhino3d windows , rhinocompute	8	1180	May 12, 2021

Using Grasshopper plugins in Hops with rhino.compute

Related topics