Not able to recognize why the RevitCloud APS automation Api failing

[akashySMPLV]

I am trying to do a POC , where basically I wanted to extract construction details from architechtural revit drawings using the Revit automation apis, was currently using the free tier before moving to the standard plan.
I had completed all the process from creating app, getting client id and screct, uploading the file to OSS, wrote a script in C# to fetch details from the revit drawing converted it to dll and used the official apis , when polling for response I get inprocess, but after thatIget a failed response.
Problem is I am notable to get why the code failed,  as the api response is not why the code failed.

Please provide whats wrong in the approach .

The python code I used 

def run_full_pipeline(input_url: str, output_url: str):
    token = get_token()
    headers = {"Authorization": f"Bearer {token}"}


    r = requests.post(f"{APS_BASE}/da/us-east/v3/appbundles",
        headers=headers,
        json={"id": BUNDLE_NAME, "engine": "Autodesk.Revit+2026"})
    print("BUNDLE CREATE:", r.status_code, r.text)

    data = r.json()
    upload_params = data["uploadParameters"]
    with open(ZIP_PATH, "rb") as f:
        r = requests.post(upload_params["endpointURL"], data=upload_params["formData"], files={"file": f})
        print("ZIP UPLOAD:", r.status_code)

    r = requests.post(f"{APS_BASE}/da/us-east/v3/appbundles/{BUNDLE_NAME}/aliases",
        headers=headers,
        json={"id": "prod", "version": 1})
    print("BUNDLE ALIAS:", r.status_code, r.text)

    r = requests.post(f"{APS_BASE}/da/us-east/v3/activities",
        headers=headers,
        json={
            "id": ACTIVITY_NAME,
            "engine": "Autodesk.Revit+2026",
            "appbundles": [f"{NICKNAME}.{BUNDLE_NAME}+prod"],
            "commandLine": [f"$(engine.path)\\revitcoreconsole.exe /i \"$(args[inputFile].path)\" /al \"$(appbundles[{BUNDLE_NAME}].path)\""],
            "parameters": {
                "inputFile": {"verb": "get", "localName": "building.rvt", "required": True},
                "result": {"verb": "put", "required": True, "localName": "output.json"},
                "appLog": {"verb": "put", "localName": "app_log.txt"},
                "failureLog": {"verb": "put", "localName": "failure_log.txt"}
            }
        })
    print("ACTIVITY:", r.status_code, r.text)

    r = requests.post(f"{APS_BASE}/da/us-east/v3/activities/{ACTIVITY_NAME}/aliases",
        headers=headers,
        json={"id": "prod", "version": 1})
    print("ACTIVITY ALIAS:", r.status_code, r.text)

    app_log_upload_url, app_log_upload_key = generate_signed_url(object_key="app_log.txt")
    failure_log_upload_url, failure_log_upload_key = generate_signed_url(object_key="failure_log.txt")

    r = requests.post(f"{APS_BASE}/da/us-east/v3/workitems",
        headers=headers,
        json={
            "activityId": f"{NICKNAME}.{ACTIVITY_NAME}+prod",
            "arguments": {
                "inputFile": {"url": input_url, "verb": "get"},
                "result": {"url": output_url, "verb": "put"},
                "appLog": {"url": app_log_upload_url, "verb": "put"},
                "failureLog": {"url": failure_log_upload_url, "verb": "put"}
            }
        })
    data = r.json()
    print("WORKITEM:", data)

    if "id" not in data:
        raise Exception(f"WorkItem failed to start: {data}")

    workitem_id = data["id"]

    while True:
        r = requests.get(f"{APS_BASE}/da/us-east/v3/workitems/{workitem_id}", headers=headers)
        status = r.json()
        print(f"Status: {status['status']}")

        if status["status"] == "success":
            break
        elif status["status"] in ("failed", "cancelled", "failedDownload", "failedInstructions"):
            if status.get("reportUrl"):
                report = requests.get(status["reportUrl"])
                print("REPORT:\n", report.text[-5000:])
            raise Exception(f"APS job {status['status']}")

        time.sleep(5)

    try:
        finalize_upload(app_log_upload_key, object_key="app_log.txt", token=token)
    except Exception as e:
        print(f"Warning: could not finalize app_log: {e}")

    try:
        finalize_upload(failure_log_upload_key, object_key="failure_log.txt", token=token)
    except Exception as e:
        print(f"Warning: could not finalize failure_log: {e}")

    try:
        app_log_download_url = generate_signed_download_url(object_key="app_log.txt", token=token)
        app_log_content = requests.get(app_log_download_url).text
    except Exception as e:
        app_log_content = f"(not available: {e})"

    try:
        failure_log_download_url = generate_signed_download_url(object_key="failure_log.txt", token=token)
        failure_log_content = requests.get(failure_log_download_url).text
    except Exception as e:
        failure_log_content = f"(not available: {e})"

    print("APP LOG:\n", app_log_content)
    print("FAILURE LOG:\n", failure_log_content)

    result = requests.get(output_url).json()
    return {"status": status, "result": result, "app_log": app_log_content, "failure_log": failure_log_content}

    
print(run_full_pipeline(input_url="",
                        output_url=""))

The C# code whose dll I am using and uploading its Zip 

using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;
using Autodesk.Revit.DB;
using Autodesk.Revit.ApplicationServices;
using Autodesk.Revit.UI;
using DesignAutomationFramework;
using Autodesk.Revit.DB.Events;

public class AppBundle : IExternalDBApplication
{
    public ExternalDBApplicationResult OnStartup(ControlledApplication app)
    {
        DesignAutomationBridge.DesignAutomationReadyEvent += OnReady;
        return ExternalDBApplicationResult.Succeeded;
    }

    public ExternalDBApplicationResult OnShutdown(ControlledApplication app)
    {
        return ExternalDBApplicationResult.Succeeded;
    }

    private void OnReady(object sender, DesignAutomationReadyEventArgs e)
    {
        try
        {
            var app = e.DesignAutomationData.RevitApp;

            app.FailuresProcessing += OnFailuresProcessing;

            Log("Started execution");

            // (Optional) Access document
            var doc = e.DesignAutomationData.RevitDoc;
            Log($"Document title: {doc.Title}");

            Log("Running custom logic...");

            // Example: count walls
            var walls = new FilteredElementCollector(doc)
                .OfClass(typeof(Wall))
                .ToElements();

            Log($"Walls count: {walls.Count}");

            // Write result file (IMPORTANT)
            File.WriteAllText("output.json", $"{{\"walls\": {walls.Count}}}");

            e.Succeeded = true;
        }
        catch (Exception ex)
        {
            Log("EXCEPTION:");
            Log(ex.ToString());

            File.WriteAllText("failure_log.txt", ex.ToString());

            e.Succeeded = false;
        }
    }

    private void OnFailuresProcessing(object sender, FailuresProcessingEventArgs e)
    {
        var fa = e.GetFailuresAccessor();
        var failures = fa.GetFailureMessages();

        if (failures == null || failures.Count == 0)
            return;

        List<string> logs = new List<string>();

        foreach (var f in failures)
        {
            logs.Add("---- FAILURE ----");
            logs.Add($"Severity: {f.GetSeverity()}");
            logs.Add($"Description: {f.GetDescriptionText()}");

            var ids = f.GetFailingElementIds();
            logs.Add($"Elements: {string.Join(",", ids.Select(x => x.Value))}");
        }

        File.WriteAllLines("failure_log.txt", logs);

        e.SetProcessingResult(FailureProcessingResult.ProceedWithRollBack);
    }

    private void Log(string message)
    {
        File.AppendAllText("app_log.txt", message + Environment.NewLine);
    }
}

 
Error message 

[03/23/2026 13:28:54] End preparing script and command line parameters. [03/23/2026 13:28:54] Start script phase. [03/23/2026 13:28:54] Start Revit Core Engine standard output dump. [03/23/2026 13:28:55] ====== Revit is running: revitcoreconsole ====== [03/23/2026 13:28:55] Current Exe path: T:\Aces\AcesRoot\26.0\coreEngine\Exe\revitcoreconsole.dll [03/23/2026 13:28:55] Echoing command line args: [03/23/2026 13:28:55] 0:/i [03/23/2026 13:28:55] 1:T:\Aces\Jobs\b38552275b2e49e38e34aca90ea2f816\building.rvt [03/23/2026 13:28:55] 2:/al [03/23/2026 13:28:55] 3:T:\Aces\Applications\f08ddaad4f90b305e0e68ef3609f3c96.LleMMVrcgXRCAB0natQ1wS6Lu2KAVirBfypcH9TmRxC6FCmO.revitapsbundle_v1[1].package [03/23/2026 13:28:55] 4:/isolate [03/23/2026 13:28:55] 5:HKEY_CURRENT_USER\SOFTWARE\AppDataLow\Software\Autodesk\CoreUser\WorkItem_b38552275b2e49e38e34aca90ea2f816 [03/23/2026 13:28:55] 6:T:\Aces\Jobs\b38552275b2e49e38e34aca90ea2f816\userdata [03/23/2026 13:28:55] Selected Revit\RCE install Path: (from app.config) [03/23/2026 13:28:55] Resolving location of Revit/RevitCoreEngine installation... [03/23/2026 13:28:55] Loading RCE .... [03/23/2026 13:29:10] Running user application.... [03/23/2026 13:29:10] Found an addIn for registration: RevitAPS.addin [03/23/2026 13:29:10] Language not specified, using English-United States(ENU) as default. [03/23/2026 13:29:42] Get RCE: (VersionBuild) 26.3.0.37 (VersionNumber) 2026 (SubVersionNumber) 2026.3 [03/23/2026 13:33:50] RESULT: Failure - Result of running user app is failure [03/23/2026 13:33:51] Finished running. Process will return: TestError [03/23/2026 13:33:51] ====== Revit finished running: revitcoreconsole ====== [03/23/2026 13:33:51] End Revit Core Engine standard output dump. [03/23/2026 13:33:51] Error: Application revitcoreconsole.exe exits with code 4 which indicates an error. [03/23/2026 13:33:51] End script phase. [03/23/2026 13:33:51] Error: An unexpected error happened during phase CoreEngineExecution of job. [03/23/2026 13:33:52] Job finished with result FailedExecution [03/23/2026 13:33:52] Job Status: { "status": "failedInstructions",

[naveen.kumar.t]

Hi @akashySMPLV ,

Could you please share your client ID and the work item report?

Please do not include your client secret.
If you prefer, you can send the report to me via a private message, and I’ll take a look.