# Errors — epcis.dev

Every `type` in a `epcis.dev` problem document resolves here, and every entry serves three faces (`.html`, `.json`, `.md`).

| slug | status | retryable | title |
|---|---|---|---|
| [`unknown-verb`](/errors/unknown-verb) | 404 | false | Unknown verb |
| [`unknown-error-slug`](/errors/unknown-error-slug) | 404 | false | Unknown error slug |
| [`snapshot-retention-expired`](/errors/snapshot-retention-expired) | 410 | false | Snapshot cannot be re-materialized |
| [`rate-limited`](/errors/rate-limited) | 429 | true | Rate limit exceeded |
| [`write-class-refused`](/errors/write-class-refused) | 400 | false | The write class cannot be asserted |