Error code

The type cannot be a singleton on this ref

A singleton type has one entry, under its own slug, and this ref holds more than that, a subtype, or its one entry under another slug. The detail names what is in the way.

Fig. 03 Ratchet and pawlThe wheel turns freely one way, and the pawl stops it turning back.

Code: SINGLETON_BLOCKED
Management API: 400

What to do

Remove or move what the detail names, then make the type a singleton.

The response

Every refusal is an application/problem+json document. Its detail says what went wrong in that request; its type is this page.

{
  "code": "SINGLETON_BLOCKED",
  "type": "https://coho-cms.com/errors/singleton-blocked",
  "title": "The type cannot be a singleton on this ref",
  "status": 400,
  "detail": "What went wrong in this request, in a sentence.",
  "instance": "/v1/projects/…"
}

Every code

The error codes, in a table with a filter.