ci: update error reference docs

src/content/docs/en/reference/error-reference.mdx

@@ -105,6 +105,7 @@ The following reference is a complete list of the errors you may encounter while
 - [**UnavailableAstroGlobal**](/en/reference/errors/unavailable-astro-global/)<br/>Unavailable Astro global in `getStaticPaths()`.
 - [**UnableToLoadLogger**](/en/reference/errors/unable-to-load-logger/)<br/>Unable to load the logger.
 - [**LoggerConfigurationNotSerializable**](/en/reference/errors/logger-configuration-not-serializable/)<br/>The configuration of the logger is not serializable.
+- [**NoManifestAvailable**](/en/reference/errors/no-manifest-available/)<br/>No manifest available.
 
 ## CSS Errors
 

src/content/docs/en/reference/errors/no-manifest-available.mdx

@@ -0,0 +1,27 @@
+---
+# NOTE: This file is auto-generated from 'scripts/error-docgen.mjs'
+# Do not make edits to it directly, they will be overwritten.
+# Instead, change this file: https://github.com/withastro/astro/blob/main/packages/astro/src/core/errors/errors-data.ts
+# Translators, please remove this note and the <DontEditWarning/> component.
+
+title: No manifest available.
+i18nReady: true
+githubURL: https://github.com/withastro/astro/blob/main/packages/astro/src/core/errors/errors-data.ts
+---
+import DontEditWarning from '~/components/DontEditWarning.astro'
+
+<DontEditWarning />
+
+
+> `new FetchState(request)` was called outside of an Astro server, so no manifest is available.
+
+## What went wrong?
+`new FetchState(request)` can only be used inside an Astro server — the built
+server output or the dev server — where Astro provides the manifest describing
+your site. This error means it was called somewhere else, for example in a
+plain Node script that imports `astro/fetch`.
+
+If this error occurs inside an Astro-built server, please [open an issue](https://astro.build/issues/).
+
+
+