Invoke Python Method - RemoteException wrapping System.IO.PipeException: error reading from the pipe: Unrecognized error 109 (0x6d)


I used invoke python method to run a py script that primarily uses pandas and numpy to clean excel data. The py script runs well with IDLE without issue. However, invoke python method reported error (exception details at the bottom) after running for a while. I tried several methods here but none of them worked:

  1. Run Studio as Admin
  2. Update Python 3.6 & packages

Hope someone could help me with this. Thank you!

Here is the detailed exception message:

RemoteException wrapping System.InvalidOperationException: Error invoking Python method —> RemoteException wrapping System.ServiceModel.CommunicationException: There was an error reading from the pipe: Unrecognized error 109 (0x6d). —> RemoteException wrapping System.IO.PipeException: There was an error reading from the pipe: Unrecognized error 109 (0x6d).
at System.ServiceModel.Channels.PipeConnection.FinishSyncRead(Boolean traceExceptionsAsErrors)
at System.ServiceModel.Channels.PipeConnection.Read(Byte buffer, Int32 offset, Int32 size, TimeSpan timeout)
— End of inner exception stack trace —

Server stack trace:
at System.ServiceModel.Channels.PipeConnection.Read(Byte buffer, Int32 offset, Int32 size, TimeSpan timeout)
at System.ServiceModel.Channels.DelegatingConnection.Read(Byte buffer, Int32 offset, Int32 size, TimeSpan timeout)
at System.ServiceModel.Channels.SessionConnectionReader.Receive(TimeSpan timeout)
at System.ServiceModel.Channels.SynchronizedMessageSource.Receive(TimeSpan timeout)
at System.ServiceModel.Channels.TransportDuplexSessionChannel.Receive(TimeSpan timeout)
at System.ServiceModel.Channels.TransportDuplexSessionChannel.TryReceive(TimeSpan timeout, Message& message)
at System.ServiceModel.Dispatcher.DuplexChannelBinder.Request(Message message, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object ins, Object outs, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at UiPath.Python.Service.IPythonService.InvokeMethod(Guid instance, String method, IEnumerable1 args) at UiPath.Python.Impl.OutOfProcessEngine.<>c__DisplayClass12_0.<InvokeMethod>b__0() at System.Threading.Tasks.Task1.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
— End of stack trace from previous location where exception was thrown —
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at UiPath.Python.Activities.InvokeMethod.d__16.MoveNext()
— End of inner exception stack trace —
at UiPath.Python.Activities.InvokeMethod.d__16.MoveNext()
— End of stack trace from previous location where exception was thrown —
at UiPath.Shared.Activities.AsyncTaskCodeActivity.EndExecute(AsyncCodeActivityContext context, IAsyncResult result)
at System.Activities.AsyncCodeActivity.System.Activities.IAsyncCodeActivity.FinishExecution(AsyncCodeActivityContext context, IAsyncResult result)
at System.Activities.AsyncCodeActivity.CompleteAsyncCodeActivityData.CompleteAsyncCodeActivityWorkItem.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)

Hello @yingyuefrank!

It seems that you have trouble getting an answer to your question in the first 24 hours.
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Cheers from your friendly

Hi @yingyuefrank

Maybe not a direct answer, but an extra info. The source code for the Python activity package is available on our Community Github repository here:

I will mark your topic with a #pr-welcome tag, if any other community member is interested to have a look at what might be wrong here.

hope you were able to solve the issue…I am also facing the sameissue,it would be helpful If you would give the solution for the above issue