Queue callback error: Step not found

[ManuLpz4]

Hey, guys! How is it going? Hope you are doing well :)

At @Plaude we build AI agents for the financial industry, when a conversation closes we trigger a classification process to determine the resolution state (resolved, not resolved, etc.) and a multi-level topic (e.g., Credit card > Rejected purchase > Not enough balance).

We have migrated to Vercel Workflow some weeks ago and days ago we start to face this issue that maintains the workflow running forever and the first Promise.all with 3 simple database queries never fails or resolve. Although the Workflow team is aware of this issue I want to ask you if any of you faced it and could help us identify the skill issue here.

• Workflow version: 4.0.1-beta.37

Workflow	Step

2025-12-28 16:20:01.508 [error] Queue callback error: Error: Step "step//workflows/shared/get-messages.ts//getMessages" not found
    at <unknown> (.next/server/chunks/[root-of-the-server]__c7054bbe._.js:69:8569)
    at <unknown> (.next/server/chunks/[root-of-the-server]__c7054bbe._.js:66:13911)
    at E.with (.next/server/chunks/_6a597eb3._.js:3:11695)
    at E.with (.next/server/chunks/_6a597eb3._.js:18:293360)
    at A.with (.next/server/chunks/_6a597eb3._.js:2:2369)
    at w.startActiveSpan (.next/server/chunks/_6a597eb3._.js:3:38348)

[haydenbleasel]

I'm experiencing the same issue.

Error

Queue callback error: Error: Step "step//lib/steps/create-lint-run.ts//createLintRun" not found
    at <anonymous> (.next/server/chunks/[root-of-the-server]__96e6ed63._.js:69:10502)
    at <anonymous> (.next/server/chunks/[root-of-the-server]__96e6ed63._.js:69:10283)
    at <anonymous> (.next/server/chunks/[root-of-the-server]__96e6ed63._.js:23:64502)
    at <anonymous> (.next/server/chunks/[root-of-the-server]__96e6ed63._.js:23:64485)
    at <anonymous> (.next/server/chunks/f34ad_@opentelemetry_api_build_esm_7e68837a._.js:1:1157)
    at <anonymous> (.next/server/chunks/f34ad_@opentelemetry_api_build_esm_7e68837a._.js:1:8019)
    at <anonymous> (.next/server/chunks/f34ad_@opentelemetry_api_build_esm_7e68837a._.js:1:18129)
    at <anonymous> (.next/server/chunks/f34ad_@opentelemetry_api_build_esm_7e68837a._.js:1:18503)
    at l (.next/server/chunks/[root-of-the-server]__96e6ed63._.js:23:64456)
    at processTicksAndRejections (null)

This happens on the very first step of my workflow.

Package Versions

{
  "workflow": "^4.0.1-beta.37",
  "@workflow/swc-plugin": "^4.0.1-beta.12"
}

Environment

• Next.js 16.1.1
• Deployed on Vercel (Production)
• Runtime: Node.js

Code Structure

My workflow is in app/api/cron/lint/lint-repo.ts and imports step functions from separate files:

Workflow file:

import { createLintRun } from "@/lib/steps/create-lint-run";

export async function lintRepoWorkflow(params: LintRepoParams): Promise<LintRepoResult> {
  "use workflow";

  // This is the first step - it fails with "Step not found"
  const lintRun = await createLintRun(organizationId, repoId);
  // ... more steps
}

Step file (lib/steps/create-lint-run.ts):

export async function createLintRun(
  organizationId: string,
  repoId: string
): Promise<Pick<LintRun, "id" | "sandboxCostUsd">> {
  "use step";

  const lintRun = await database.lintRun.create({
    data: {
      organizationId,
      repoId,
      status: "RUNNING",
      startedAt: new Date(),
    },
    select: {
      id: true,
      sandboxCostUsd: true,
    },
  });

  return lintRun;
}

The step ID in the error (step//lib/steps/create-lint-run.ts//createLintRun) matches the pattern in your error (step//workflows/shared/get-messages.ts//getMessages), suggesting this is the same underlying issue with step resolution when steps are defined in separate files.

---

Note: #438 may be a duplicate of this issue - it also reports "workflow step not found" errors.

[pauledrupt]

you might want to try pinning to 4.0.1-beta.35