Cannot convert input parameter to type 'Microsoft.DurableTask.TaskOrchestrationContext' from type 'System.String'

[Krusty93]

I am trying to set durable functions as follow:

using System.Threading.Tasks;
using Microsoft.Azure.Functions.Worker;
using Microsoft.DurableTask;

public class QAReportOrchestrationFunction
{
    [Function(nameof(TimerTriggerStart))]
    public static async Task TimerTriggerStart(
        [TimerTrigger("0 6 * * Mon", RunOnStartup = true)] TimerInfo timer,
        [DurableClient] DurableClientContext starter,
        FunctionContext functionContext)
    {
        var orchestrationId = await starter.Client.ScheduleNewOrchestrationInstanceAsync(nameof(RunOrchestrator));
    }

    [Function(nameof(RunOrchestrator))]
    public static async Task<string> RunOrchestrator(
        [OrchestrationTrigger] TaskOrchestrationContext context)
    {
        string result = "";
        result += await context.CallActivityAsync<string>(nameof(SayHello), "Tokyo") + " ";
        result += await context.CallActivityAsync<string>(nameof(SayHello), "London") + " ";
        result += await context.CallActivityAsync<string>(nameof(SayHello), "Seattle");
        return result;
    }

    [Function(nameof(SayHello))]
    public static string SayHello(
        [ActivityTrigger] string name)
    {
        return $"Hello {name}!";
    }
}

internal class Program
{
    public static async Task Main(string[] _)
    {
        var host = new HostBuilder()
            .ConfigureFunctionsWorkerDefaults()
            .Build();

        await host.RunAsync();
    }
}

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <AzureFunctionsVersion>v4</AzureFunctionsVersion>
    <OutputType>Exe</OutputType>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.8.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.DurableTask" Version="0.4.1-beta" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http" Version="3.0.13" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Timer" Version="4.1.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.3.0" OutputItemType="Analyzer" />
  </ItemGroup>

  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>

</Project>

{
  "IsEncrypted": false,
  "Values": {
    "ASPNETCORE_ENVIRONMENT": "Development",
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated"
  }
}

However, when the client function tries to invoke the orchestrator function, I get this error:

[2022-08-31T10:42:51.972Z] Executing 'Functions.TimerTriggerStart' (Reason='Timer fired at 2022-08-31T12:42:51.9287484+02:00', Id=2722cf45-75e1-4c74-ba2b-f36733270863)
[2022-08-31T10:42:51.976Z] Trigger Details: UnscheduledInvocationReason: RunOnStartup
[2022-08-31T10:42:53.760Z] Worker process started and initialized.
[2022-08-31T10:42:56.558Z] Host lock lease acquired by instance ID '00000000000000000000000067BD87D1'.
[2022-08-31T10:43:19.964Z] Scheduling new RunOrchestrator orchestration with instance ID '0e90a778968a44d3ab39c924d01bc6c7' and 0 bytes of input data.
[2022-08-31T10:43:20.287Z] Executing 'Functions.RunOrchestrator' (Reason='(null)', Id=e4b48ac1-2255-45fd-9be8-10b7b0fd371e)
[2022-08-31T10:43:21.283Z] Executed 'Functions.TimerTriggerStart' (Succeeded, Id=2722cf45-75e1-4c74-ba2b-f36733270863, Duration=29336ms)
[2022-08-31T10:43:21.342Z] Executed 'Functions.RunOrchestrator' (Failed, Id=e4b48ac1-2255-45fd-9be8-10b7b0fd371e, Duration=1069ms)
[2022-08-31T10:43:21.345Z] System.Private.CoreLib: Exception while executing function: Functions.RunOrchestrator. System.Private.CoreLib: Result: Failure
Exception: Microsoft.Azure.Functions.Worker.FunctionInputConverterException: Error converting 1 input parameters for Function 'RunOrchestrator': Cannot convert input parameter 'context' to type 'Microsoft.DurableTask.TaskOrchestrationContext' from type 'System.String'. Error:System.Text.Json.JsonException: 'C' is an invalid start of a value. Path: $ | LineNumber: 0 | BytePositionInLine: 0.
[2022-08-31T10:43:21.345Z]  ---> System.Text.Json.JsonReaderException: 'C' is an invalid start of a value. LineNumber: 0 | BytePositionInLine: 0.

I literally don't get where this string is coming from and what could be its value. This is a brand new project and I'm cleaning Azurite storage at each run. Tried both VS and VS Code

EDIT:
Changing the RunOrchestrator function parameter I can get the string value:

    [Function(nameof(RunOrchestrator))]
    public static async Task<string> RunOrchestrator(
        [OrchestrationTrigger] string context)
    {
        await Task.Delay(190);
        string result = "";
        return result;
    }

context value: CiAxZTZhYjQxMmMyMzc0Zjc5YWM4NzllMzFkNmE3ZDkwYSIaCP///////////wESCwiuqL2YBhCU2Ys5cgAigwEI////////////ARIMCK2ovZgGEOTKvcQDGmgKD1J1bk9yY2hlc3RyYXRvchIAGgcKBSJhYWEiIkoKIDFlNmFiNDEyYzIzNzRmNzlhYzg3OWUzMWQ2YTdkOTBhEiYKJDRlZDA4ZDE4LTg4NjMtNDMyNC05NzBhLWY1MjkwNDQ3YTEyYg==

[kshyju]

Could you try using the latest preview version(1.7.0-preview2) of the Microsoft.Azure.Functions.Worker.Sdk package?

[Krusty93]

@kshyju, I confirm that it works with the package version you suggested. Thanks!