# X_OPENAPI_CONFIG_INVALID

## Means

defineApi's openapi block cannot produce a valid document

## Typical cause

an empty `title` or `version`, a `servers` URL that is relative or not http(s), or a mount document whose file name does not end in `.json` — the cause names which

## Fix

defineApi({ ..., openapi: { title: 'My API', version: '1.0.0', servers: [{ url: 'https://www.example.com' }] } }) — non-empty title and version, absolute http(s) server URLs, and a document file name ending in .json

[Actions](/error-codes#actions)