Have followed most of the suggestions in other posts. Dotnet is up to date, Trying to get Hops running for the first time. Using the Rhino Standard helloWorld.gh as the HOPS path. Cannot get Hops to populate its blank component. It shows the error message in the title.
Server is running. Have tried Ctrl-C and spinning up another server via Powershell and .\rhino.compute.exe from the directory, gives the same or similar result with entering the new port into the GH preferences.
Click here for the DOS console.
RC [18:12:39 INF] Rhino compute started at 4/13/2026 6:12:39 PM
RC [18:12:39 DBG] Config:
RC [18:12:39 DBG] Max Request Size = 50.00 MB
RC [18:12:39 DBG] Timeout = 1 min 40 secs
RC [18:12:39 DBG] Child Count = 1
RC [18:12:39 DBG] Spawn Children At Startup = True
RC [18:12:39 DBG] Load Grasshopper = True
RC [18:12:39 DBG] Create Headless Document = False
RC [18:12:39 DBG] Log Path = C:\Users\SHAW\AppData\Local\Temp\Compute\Logs
RC [18:12:39 DBG] Hosting starting
RC [18:12:39 DBG] Found module rhino.compute.ReverseProxyModule
RC [18:12:39 DBG] Initiliazing reverse proxy at 4/13/2026 6:12:39 PM
RC [18:12:39 INF] Now listening on: http://localhost:6500
RC [18:12:39 INF] Application started. Press Ctrl+C to shut down.
RC [18:12:39 INF] Hosting environment: Production
RC [18:12:39 INF] Content root path: C:\Users\SHAW\AppData\Roaming\McNeel\Rhinoceros\packages\9.0\Hops\0.16.28\rhino.compute
RC [18:12:39 DBG] Hosting started
RC [18:12:43 INF] Starting compute.geometry instance on port 6001
CG [18:12:44 DBG] Logging to C:\Users\SHAW\AppData\Local\Temp\Compute\Logs
CG [18:12:44 DBG] Registering idle span value of 3600 seconds
CG [18:12:45 INF] Child process started at 4/13/2026 6:12:45 PM
CG [18:12:45 INF] Compute 8.0.0.0, Rhino 9.0.26098.18305
CG [18:12:45 DBG] Rhino system directory: D:\Program Files\Rhino 9 WIP\System
CG [18:12:45 DBG] Hosting starting
RC [18:13:39 INF] Max concurrent requests = 0
RC [18:13:43 INF] Unable to start a local compute server
RC [18:14:11 ERR] HTTP POST /io responded 500 in 29159.7373 ms
System.Exception: Unable to start a local compute server
at rhino.compute.ComputeChildren.LaunchCompute(Queue1 processQueue, Boolean waitUntilServing) in D:\BuildAgent\work\4852f584398a78e4\src\rhino.compute\ComputeChildren.cs:line 233 at rhino.compute.ComputeChildren.GetComputeServerBaseUrl() in D:\BuildAgent\work\4852f584398a78e4\src\rhino.compute\ComputeChildren.cs:line 100 at rhino.compute.ReverseProxyModule.<>c.b__5_0() in D:\BuildAgent\work\4852f584398a78e4\src\rhino.compute\ReverseProxy.cs:line 42 at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state) — End of stack trace from previous location — at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread) — End of stack trace from previous location — at rhino.compute.ReverseProxyModule.AwaitInitTask() in D:\BuildAgent\work\4852f584398a78e4\src\rhino.compute\ReverseProxy.cs:line 118 at rhino.compute.ReverseProxyModule.ReverseProxyPost(HttpRequest req, HttpResponse res) in D:\BuildAgent\work\4852f584398a78e4\src\rhino.compute\ReverseProxy.cs:line 178 at Serilog.AspNetCore.RequestLoggingMiddleware.Invoke(HttpContext httpContext) RC [18:14:11 ERR] Connection id “0HNKP7J7V7LV5”, Request id “0HNKP7J7V7LV5:00000001”: An unhandled exception was thrown by the application. System.Exception: Unable to start a local compute server at rhino.compute.ComputeChildren.LaunchCompute(Queue1 processQueue, Boolean waitUntilServing) in D:\BuildAgent\work\4852f584398a78e4\src\rhino.compute\ComputeChildren.cs:line 233
at rhino.compute.ComputeChildren.GetComputeServerBaseUrl() in D:\BuildAgent\work\4852f584398a78e4\src\rhino.compute\ComputeChildren.cs:line 100
at rhino.compute.ReverseProxyModule.<>c.b__5_0() in D:\BuildAgent\work\4852f584398a78e4\src\rhino.compute\ReverseProxy.cs:line 42
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
— End of stack trace from previous location —
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
— End of stack trace from previous location —
at rhino.compute.ReverseProxyModule.AwaitInitTask() in D:\BuildAgent\work\4852f584398a78e4\src\rhino.compute\ReverseProxy.cs:line 118
at rhino.compute.ReverseProxyModule.ReverseProxyPost(HttpRequest req, HttpResponse res) in D:\BuildAgent\work\4852f584398a78e4\src\rhino.compute\ReverseProxy.cs:line 178
at Serilog.AspNetCore.RequestLoggingMiddleware.Invoke(HttpContext httpContext)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)
RC [18:14:39 INF] Max concurrent requests = 0
RC [18:15:39 INF] Max concurrent requests = 0
RC [18:16:39 INF] Max concurrent requests = 0
RC [18:17:39 INF] Max concurrent requests = 0
RC [18:18:39 INF] Max concurrent requests = 0