# X_CLIENT_SPEC_INVALID

## Means

x client was handed a document that is not OpenAPI 3.0 or 3.1

## Typical cause

the file or URL given to --from is not JSON, or is JSON without an openapi field of 3.0.x or 3.1.x

## Fix

`x help client --json` — then point --from at the OpenAPI 3.0 or 3.1 document itself

[CLI and verify](/error-codes#cli-and-verify)