What causes "following errors occurred %s" in GoogleContainerTools/skaffold?

Read each line after the prefix — each is an individual root-cause error to fix.

following errors occurred %s

Error message

following errors occurred %s

What it means

diag's Run collects errors from multiple validators/checkers into `errs`; if any occurred, it concatenates their messages (newline-separated) and returns a single aggregate error `following errors occurred <list>`. It is an error-aggregation pattern: the root causes appear inside the message body, not in the wrapper itself.

Source

Thrown at pkg/diag/diag.go:87

	for _, v := range d.validators {
		for _, ns := range d.namespaces {
			r, err := v.Validate(ctx, ns, listOptions)
			res = append(res, r...)
			if err != nil {
				errs = append(errs, err)
			}
		}
	}
	if len(errs) == 0 {
		return res, nil
	}

	errBuilder := ""
	for _, err := range errs {
		errBuilder = errBuilder + err.Error() + "\n"
	}

	return res, fmt.Errorf("following errors occurred %s", errBuilder)
}

View on GitHub (pinned to a1189de023)

Solutions

Read each line after the prefix — each is an individual root-cause error to fix.
Re-run `skaffold diagnose` after fixing the first reported issue to see if fewer errors remain.
Use `kubectl describe`/`kubectl logs` on the specific resources named in the aggregated errors.

Defensive patterns

Strategy: try-catch

Try / catch

if err := diag.Run(ctx); err != nil {
    for _, line := range strings.Split(strings.TrimPrefix(err.Error(), "following errors occurred "), "\n") {
        if line != "" { log.Printf("underlying issue: %s", line) }
    }
}

Prevention

Split the aggregated message on newlines to triage each root cause individually.
Fix underlying k8s issues (RBAC, images, CRDs) before re-running diagnose.
Run diagnose against a single namespace to limit error surface.

When it happens

Trigger: Running `skaffold diagnose` (or the diag Run pipeline) when one or more resource validators or health checks each return an error; the aggregate is returned once all checks complete.

Common situations: Multiple failing deployments in a namespace (CrashLoopBackOff + missing RBAC + image pull errors) all reported at once during diagnose; debugging CI where several pods are unhealthy.

Related errors

AI-assisted analysis of GoogleContainerTools/skaffold@a1189de023 (2026-09-05). Data as JSON: /api/errors/d0d4133397bc0146. Report an issue: GitHub.