Missing argument for function parameter

[EVENFLOW212]

We are using SK version 1.34 (.NET core)

and reproducible error like below shows up for simple function in a plugin with only one parameter. How can this be fixed, make the app unpredictable and framework unpredictable

The same question gets answered few time and then the same question has the error below.

System.ArgumentException: Missing argument for function parameter (Parameter 'userQuery')
--- End of inner exception stack trace ---
at Microsoft.SemanticKernel.KernelFunctionFromMethod.<>c__DisplayClass23_0.g__parameterFunc|9(KernelFunction _, Kernel kernel, KernelArguments arguments, CancellationToken __)
at Microsoft.SemanticKernel.KernelFunctionFromMethod.<>c__DisplayClass21_0.g__Function|0(Kernel kernel, KernelFunction function, KernelArguments arguments, CancellationToken cancellationToken)
at Microsoft.SemanticKernel.KernelFunctionFromMethod.InvokeCoreAsync(Kernel kernel, KernelArguments arguments, CancellationToken cancellationToken)
at Microsoft.SemanticKernel.KernelFunction.<>c__DisplayClass27_0.<b__0>d.MoveNext()
--- End of stack trace from previous location ---
at Microsoft.SemanticKernel.Kernel.InvokeFilterOrFunctionAsync(NonNullCollection1 functionFilters, Func2 functionCallback, FunctionInvocationContext context, Int32 index)
at Microsoft.SemanticKernel.Kernel.OnFunctionInvocationAsync(KernelFunction function, KernelArguments arguments, FunctionResult functionResult, Boolean isStreaming, Func`2 functionCallback, CancellationToken cancellationToken)
at Microsoft.SemanticKernel.KernelFunction.InvokeAsync(Kernel kernel, KernelArguments arguments, CancellationToken cancellationToken)
at Microsoft.SemanticKernel.FunctionCallContent.InvokeAsync(Kernel kernel, CancellationToken cancellationToken)

Thanks

[sophialagerkranspandey]

Can you please provide additional code so we can help with repo-ing the issue.

[EVENFLOW212]

Hi Sophia,

we are making these calls

OpenAIPromptExecutionSettings settings = new() {
FunctionChoiceBehavior = FunctionChoiceBehavior.Auto(autoInvoke: false)
};

result = await chat.GetChatMessageContentAsync(chatHistory, settings, kernel, CancellationToken.None);

IEnumerable functionCalls = FunctionCallContent.GetFunctionCalls(result);

foreach (var functionCall in functionCalls)
{
FunctionResultContent functionResult = await functionCall.InvokeAsync(kernel);
}

As show in stack trace above, there Missing argument for function parameter

at Microsoft.SemanticKernel.FunctionCallContent.InvokeAsync(Kernel kernel, CancellationToken cancellationToken)

We have a plugin that just takes a string userQuery parameter.

where the parameter is as below

[Description("User query")] string userQuery

Thanks

[sophialagerkranspandey]

Tagging @SergeyMenshykh

[SergeyMenshykh]

Hi @EVENFLOW212, for some reason, no arguments are provided during function invocation. Looking at the code snippet, it's impossible to tell what is causing it. Please distill your code into a simple console app or a code snippet that reproduces the issue and share it with us so we can run it and see what's wrong.