Hi, I have a python script that will return a list of strings. What option should i choose for to convert the python object to .net type and in general is there a thumb of rule which type to choose to go with which python type ? Thank you!

Hi @ivory_le First you use Invoke Python method activity to run python code. The result of the invoked method, stored in a PythonObject variable. Can be further processed using the Get Python Object activity and converted to a .NET datatype. Activities - Invoke Python Method The UiPath Documentation Portal - the home of all our valuable information. Find here everything you need to guide you in your automation journey in the UiPath ecosystem, from complex installation guides to quick tutorials, to practical business...

Hi I used Get Python Object but im encountering this error in Test.xaml at InvokeMethod “Invoke Python Method” at Sequence “Do” at PythonScope “Python Scope” at Sequence “Test” at Test “Test” System.AggregateException: One or more errors occurred. (Error invoking Python method) —> System.InvalidOperationException: Error invoking Python method —> System.NullReferenceException: Object reference not set to an instance of an object. at UiPath.Python.Impl.OutOfProcessEngine.<>c__DisplayClass15_0.b__0() at System.Threading.Tasks.Task`1.InnerInvoke() 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 UiPath.Python.Activities.InvokeMethod.ExecuteAsync(AsyncCodeActivityContext context, CancellationToken cancellationToken) — End of inner exception stack trace — at UiPath.Python.Activities.InvokeMethod.ExecuteAsync(AsyncCodeActivityContext context, CancellationToken cancellationToken) — End of inner exception stack trace — at UiPath.Shared.Activities.AsyncTaskCodeActivity.EndExecute(AsyncCodeActivityContext context, IAsyncResult result) at System.Activities.AsyncCodeActivity.CompleteAsyncCodeActivityData.CompleteAsyncCodeActivityWorkItem.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager) my script return a string and i want to convert it into a string type side quetion: if i have a list of strings returned what should i convert to in .net type

[Bild] ivory_le: (Error invoking Python method) —> System.InvalidOperationException: Error invoking Python method —> System.NullReferenceException: Object reference not set to an instance of an object. at UiPath.Python.Impl.OutOfProcessEngine. Hi @ivory_le Refer below post and see if points mentioned helps. Also could you share the screenshot of your workflow? what all activities you are using? [Bild] Invoke Python Method goes into errors! Activities Hey @Re_Walter, I hope you’re well. I get this error quite often when working with Python scripts in UiPath and these are my steps to debug, hopefully one of them help you: Run your Python script from the Command Prompt to see what output you get. Reference your Python Interpreter in Command Prompt to ensure you get the same output. This should tell you what the error is. I like to double check that all libraries are installed and working, especially if I’m recreating virtual environments, so…

[Screenshot 2025-07-23 133629] I’m using load python script => invoke => get python object => log message i ran my script in code editor and it worked and it returned a single string here is my get python object set up [Screenshot 2025-07-23 133755]

[Bild] ivory_le: ere is my get python object set up You are getting error on which activity is it on python scope then check python path you configured correctly?

[Bild] ivory_le: System.InvalidOperationException: Error invoking Python method —> System.NullReferenceException: Object reference not set to an instance of an object This part suggests that issue is with calling python method. looks like the variable you are using is null. could you run this workflow in debug mode and see what activity it is failing and from local panel, verify that variables have values assigned?

I’m getting this error: error CS0246: The type or namespace name ‘GlobalVariablesNamespace’ could not be found (are you missing a using directive or an assembly reference?) error CS0246: The type or namespace name ‘GlobalConstantsNamespace’ could not be found (are you missing a using directive or an assembly reference?)

Can you share your python script?

import pandas as pd def get_bot(): bot_file_path = r".some_file_path" # Load the Excel file into a DataFrame df_bot_table = pd.read_excel(bot_file_path) # Define the conditions for filtering conditions = ( (df_bot_table["a"] == True) & (df_bot_table["b"] == 1) ) filtered_df = df_bot_table[conditions] return filtered_df["Prod"].tolist()[0] sorry i have to change some of the name but this script interact with another xlsx file and return a string

Hi this is my issue now it said i can’t convert to a string in Test.xaml at GetObject`1 “Get Python Object” at Sequence “Do” at PythonScope “Python Scope” at Sequence “Test” at Test “Test” System.InvalidOperationException: Error converting Python object —> System.InvalidOperationException: Python instantiation exception Python Invoker program exception: ‘module’ value cannot be converted to System.String at UiPath.Shared.Service.PythonResponse.ThrowExceptionIfNeeded() at UiPath.Python.Service.PythonProxy.Convert(Guid obj, String t) at UiPath.Python.Impl.OutOfProcessEngine.Convert(PythonObject obj, Type t) at UiPath.Python.Activities.GetObject1.Execute(CodeActivityContext context) --- End of inner exception stack trace --- at UiPath.Python.Activities.GetObject1.Execute(CodeActivityContext context) at System.Activities.CodeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager) at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)

Python-Objektfunktion abrufen

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sonaliaggarwal47 (Sonali Aggarwal) 23. Juli 2025 um 17:34 4

Hallo @ivory_le,

schau dir den folgenden Beitrag an und prüfe, ob die dort genannten Hinweise helfen. Könntest du außerdem einen Screenshot deines Workflows teilen? Welche Aktivitäten verwendest du?

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Python-Objektfunktion abrufen

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