BUILDER_RELATION_TARGET_UNKNOWN

Cause

A relationship field in ui-schema.json names a collection that neither file declares.

A relationship or upload field the Schema Builder saved in ui-schema.json relates to a collection that neither ui-schema.json nor nextly.config.ts declares, and that is not users or media. The Why line lists each field and its target.

Fix

• Point each field listed at an existing collection, in the Schema Builder or in ui-schema.json.
• Or create the collection it names.
• Run nextly migrate:check again.

Example

✗ A field in `ui-schema.json` relates to a collection that does not exist.
  Why:  articles.author relates to unknown target 'authors'
  Next: Point each field listed at a collection in `nextly.config.ts` or `ui-schema.json`, or create the collection it names, then run the command again.
  Docs: https://nextlyhq.com/docs/cli/errors/builder-relation-target-unknown  (BUILDER_RELATION_TARGET_UNKNOWN)