knowledge_upload_no_text
The document parsed but carries no extractable text - an image-only scan is the usual cause, and OCR must run before it can become a pack. A refusal on purpose: letting it through would publish a pack silently missing exactly the facts the tenant uploaded.
Problem shape
Every non-2xx response is an RFC 9457 application/problem+json body. The type URI below is stable and machine-matchable, so branch on the final path segment (the code) and treat the status as redundant confirmation. See the error-handling guide.
{
"type": "https://docs.vocapable.com/errors/knowledge_upload_no_text",
"title": "…",
"status": 422,
"detail": "…",
"instance": "/v1/…"
}