CircleCI "Skipping cache - error checking cache" in CI

A restore_cache step could not load a cache: either no saved key matched, or the cache service returned an error so CircleCL skipped restoration. The job still runs but reinstalls everything from scratch.

What this error means

The restore step logs "Skipping cache - error checking cache" or "No cache found for key ...", and later steps reinstall dependencies fully.

CircleCI

Found a cache from key reduce-...
Skipping cache - error checking cache: ...
No cache is found for key: deps-v1-{{ checksum "package-lock.json" }}

Common causes

The key changed so nothing matched

A checksum over a lockfile that changed produces a new key, so the first run on that lockfile is always a miss.

A transient cache service error

A momentary backend error during the lookup makes CircleCL skip the cache rather than fail the job.

How to fix it

Add a fallback restore key

Use an exact key plus a broader prefix fallback.
Save under the same exact key so future runs hit.
Re-run twice: the second run should restore.

.circleci/config.yml

- restore_cache:
    keys:
      - deps-v1-{{ checksum "package-lock.json" }}
      - deps-v1-
- run: npm ci
- save_cache:
    key: deps-v1-{{ checksum "package-lock.json" }}
    paths: [~/.npm]

Treat a single transient skip as retryable

A one-off "error checking cache" is usually transient; re-run the job, and only investigate if it persists.

How to prevent it

Always pair an exact key with a prefix fallback.
Save and restore under matching key templates.
Bump a cache version prefix when the cache format changes.