microsoft/semantic-kernel · error · InvalidOperationException

Process not found

Error message

Process not found

What it means

Thrown by `DaprTestProcessContext.GetStateAsync` when `GetFromJsonAsync<DaprProcessInfo>` returns null for the process state endpoint on port 5200. A null deserialization result means the host responded with empty or non-JSON content for the given process id. It is an InvalidOperationException.

Source

Thrown at dotnet/src/Experimental/Process.IntegrationTestRunner.Dapr/DaprTestProcessContext.cs:59

    /// <returns></returns>
    internal async Task StartWithEventAsync(KernelProcessEvent initialEvent)
    {
        var daprProcess = DaprProcessInfo.FromKernelProcess(this._process);
        var request = new ProcessStartRequest { Process = daprProcess, InitialEvent = initialEvent.ToJson() };

        var response = await this._httpClient.PostAsJsonAsync($"http://localhost:5200/processes/{this._processId}", request, options: this._serializerOptions).ConfigureAwait(false);
        if (!response.IsSuccessStatusCode)
        {
            throw new InvalidOperationException("Failed to start process");
        }
    }

    public override async Task<KernelProcess> GetStateAsync()
    {
        var response = await this._httpClient.GetFromJsonAsync<DaprProcessInfo>($"http://localhost:5200/processes/{this._processId}", options: this._serializerOptions);
        return response switch
        {
            null => throw new InvalidOperationException("Process not found"),
            _ => response.ToKernelProcess()
        };
    }

    public override Task SendEventAsync(KernelProcessEvent processEvent)
    {
        throw new NotImplementedException();
    }

    public override Task StopAsync()
    {
        throw new NotImplementedException();
    }

    public override async Task<IExternalKernelProcessMessageChannel?> GetExternalMessageChannelAsync()
    {
        var response = await this._httpClient.GetFromJsonAsync<MockCloudEventClient>($"http://localhost:5200/processes/{this._processId}/mockCloudClient", options: this._serializerOptions);
        return response switch

View on GitHub (pinned to c028a0c7dc)

Solutions

1. Confirm `_processId` was returned by a successful start call and is still active on the host.
2. Check the host logs/health and retry after the process is confirmed running.
3. Verify client and host agree on the `DaprProcessInfo` schema/version.

Example fix

// before
var response = await this._httpClient.GetFromJsonAsync<DaprProcessInfo>(url);
return response;
// after
var response = await this._httpClient.GetAsync(url);
response.EnsureSuccessStatusCode();
var info = await response.Content.ReadFromJsonAsync<DaprProcessInfo>();
return info ?? throw new InvalidOperationException($"Process {_processId} returned empty state");

using var probe = await httpClient.GetAsync($"http://localhost:5200/processes/{processId}");
if (!probe.IsSuccessStatusCode)
    throw new InvalidOperationException($"Process {processId} not reachable: {probe.StatusCode}");
// then call GetStateAsync()

bool ProcessIdLooksValid(string id) => !string.IsNullOrWhiteSpace(id);

try { var state = await context.GetStateAsync(); }
catch (InvalidOperationException ex) when (ex.Message == "Process not found")
{ _logger.LogError(ex, "Process {Id} not found on Dapr host.", processId); throw; }

When it happens

Trigger: Request state for a `_processId` that was never started or has been evicted; the host returns an empty 200 body; deserialization into `DaprProcessInfo` yields null due to a schema/JSON mismatch.

Common situations: Querying state before the process is fully started; the Dapr host lost/restarted the process; version mismatch between client and host `DaprProcessInfo` shapes; wrong process id.

Related errors

• Failed to start process
• Dapr Test Host did not start
• This method is not implemented in this test fixture.
• The Map must be initialized before accessing the Name proper
• The process cannot be started before it has been initialized

AI-assisted analysis of microsoft/semantic-kernel@c028a0c7dc (2026-08-13). Data as JSON: /api/errors/02a16f8156855ef9. Report an issue: GitHub.