{"record":{"id":"22eaabd1284bc16b","repo":"microsoft/semantic-kernel","slug":"the-activateasync-method-failed-to-complete","errorCode":null,"errorMessage":"The ActivateAsync method failed to complete.","messagePattern":"The ActivateAsync method failed to complete\\.","errorType":"exception","errorClass":"KernelException","httpStatus":null,"severity":"error","filePath":"dotnet/src/Experimental/Process.LocalRuntime/LocalStep.cs","lineNumber":318,"sourceCode":"        // Activate the step with user-defined state if needed\n        Type stateType = this._stepInfo.InnerStepType.ExtractStateType(out Type? userStateType, this._logger);\n        KernelProcessStepState stateObject = this._stepInfo.State;\n        stateObject.InitializeUserState(stateType, userStateType);\n\n        if (stateObject is null)\n        {\n            throw new KernelException(\"The state object for the KernelProcessStep could not be created.\").Log(this._logger);\n        }\n\n        MethodInfo methodInfo =\n            this._stepInfo.InnerStepType.GetMethod(nameof(KernelProcessStep.ActivateAsync), [stateType]) ??\n            throw new KernelException(\"The ActivateAsync method for the KernelProcessStep could not be found.\").Log(this._logger);\n\n        this._stepState = stateObject;\n\n        ValueTask activateTask =\n            (ValueTask?)methodInfo.Invoke(this._stepInstance, [stateObject]) ??\n            throw new KernelException(\"The ActivateAsync method failed to complete.\").Log(this._logger);\n\n        await this._stepInstance.ActivateAsync(stateObject).ConfigureAwait(false);\n        await activateTask.ConfigureAwait(false);\n    }\n\n    /// <summary>\n    /// Deinitializes the step\n    /// </summary>\n    public virtual Task DeinitializeStepAsync()\n    {\n        this._logger.LogInformation(\"Step {Name} has deinitialized\", this.Name);\n        return Task.CompletedTask;\n    }\n\n    /// <summary>\n    /// Invokes the provides function with the provided kernel and arguments.\n    /// </summary>\n    /// <param name=\"function\">The function to invoke.</param>","sourceCodeStart":300,"sourceCodeEnd":336,"githubUrl":"https://github.com/microsoft/semantic-kernel/blob/c028a0c7dc4f0814cdcbaba9d998f187a41197bf/dotnet/src/Experimental/Process.LocalRuntime/LocalStep.cs#L300-L336","documentation":"Thrown by LocalStep.InitializeStepAsync when the reflection-invoked ActivateAsync method returns null instead of a ValueTask. After locating the method via GetMethod, the code invokes it and casts the result to ValueTask?; a null result means the method's actual return type is not ValueTask (e.g., it returns void, Task, or null).","triggerScenarios":"The step type declares an ActivateAsync method with the right parameter type but a different return type than ValueTask, so the cast to ValueTask? produces null and the null-coalescing throw fires.","commonSituations":"A custom step where ActivateAsync returns Task or void instead of ValueTask; the method is a 'new' slot or hides the base method; signature drift between the declared override and what reflection binds to.","solutions":["Ensure ActivateAsync returns ValueTask, matching the KernelProcessStep contract.","If overriding in a generic step, use 'public override ValueTask ActivateAsync(TState state)'.","Avoid declaring ActivateAsync with a non-ValueTask return type."],"exampleFix":"// before - returns Task\nclass MyStep : KernelProcessStep<MyState> {\n    public override Task ActivateAsync(MyState state) { ... }\n}\n// after - returns ValueTask\nclass MyStep : KernelProcessStep<MyState> {\n    public override ValueTask ActivateAsync(MyState state) { ... }\n}","handlingStrategy":"type-guard","validationCode":null,"typeGuard":"// Verify ActivateAsync returns ValueTask\nvar stateType = typeof(MyStep).ExtractStateType(out _, logger);\nvar method = typeof(MyStep).GetMethod(nameof(KernelProcessStep.ActivateAsync), [stateType]);\nif (method?.ReturnType != typeof(ValueTask)) { /* return type mismatch */ }","tryCatchPattern":null,"preventionTips":["Ensure ActivateAsync overrides return ValueTask, not Task or void.","Use the generic KernelProcessStep<TState> base class which defines the correct signature.","Add a compile-time or startup check on return types of overridden methods."],"tags":["process-framework","step","reflection","activation","api-contract"],"backgroundTag":null,"analyzedSha":"c028a0c7dc4f0814cdcbaba9d998f187a41197bf","analyzedAt":"2026-08-13T13:48:05.040Z","schemaVersion":2},"datasetVersion":"2026-08-13T14:17:21.547Z"}