---
title: Errors
description: "Common CLI and build error messages, their cause, and the fix."
---

| Message | Cause and fix |
| --- | --- |
| `handler must default-export an object with fetch(request)` | The file has no `export default { fetch(...) }`. |
| `imports are not supported` / `Node, Bun, and Deno APIs are not supported` | Remove `import` / `require` / `process` / `node:*`. One file, standard JS only. |
| `outbound networking needs an \`outbound\` host allowlist` | Add the host to `outbound` in [`sproutboat.jsonc`](/concepts/configuration). |
| `binding X: no resource <id>` | The config references an id you do not own. Run the storage product's `create` command, such as `sproutboat kv create <name>`, or use a bare name and let deploy provision it — see [Storage resources](/storage). |
| `not serving after 90s` | The sprout is crashing or Caddy is still issuing the cert. Check `sproutboat tail --sprout`. |
| `X does not resolve to this server` (on `domains verify`) | Add the A record, DNS-only. Re-run after DNS propagates — see [Custom domains](/platform/custom-domains). |
| `deploy the project at least once before ...` | `secrets` and `domains` require an existing deployment. |