GoogleContainerTools/skaffold · error

source: %s, %s on line %d column %d

Error message

source: %s, %s on line %d column %d

What it means

The located variant of wrapWithContext: it wraps a validation error with 'source: <file>, <config id> on line L column C' when the error carries a valid parse Location. This points the developer to the exact position in skaffold.yaml that failed validation.

Source

Thrown at pkg/skaffold/schema/validation/validation.go:841

		}
	}
	return
}

func wrapWithContext(config *parser.SkaffoldConfigEntry, errs ...ErrorWithLocation) []ErrorWithLocation {
	var id string
	if config.Metadata.Name != "" {
		id = fmt.Sprintf("in module %q", config.Metadata.Name)
	} else {
		id = fmt.Sprintf("in unnamed config[%d]", config.SourceIndex)
	}

	for i := range errs {
		if errs[i].Location == nil || errs[i].Location.StartLine == -1 {
			errs[i].Error = errors.Wrapf(errs[i].Error, "source: %s, %s", config.SourceFile, id)
			continue
		}
		errs[i].Error = errors.Wrapf(errs[i].Error, "source: %s, %s on line %d column %d",
			config.SourceFile, id, errs[i].Location.StartLine, errs[i].Location.StartColumn)
	}
	return errs
}

// validateKubectlManifests
// - validates that kubectl manifest files specified in the skaffold config exist
func validateKubectlManifests(configs parser.SkaffoldConfigSet) (errs []ErrorWithLocation) {
	for _, c := range configs {
		if c.IsRemote {
			continue
		}
		if len(c.Render.RawK8s) == 1 && c.Render.RawK8s[0] == constants.DefaultKubectlManifests[0] {
			log.Entry(context.TODO()).Debug("skipping validating `kubectl` deployer manifests since only the default manifest list is defined")
			continue
		}

		// validate that manifest files referenced in config exist

View on GitHub (pinned to a1189de023)

Solutions

1. Open skaffold.yaml at the reported line/column and correct the offending value
2. Check image name constraints (lowercase, no underscores, valid registry) if validateImageNames flagged it
3. Run `skaffold fix` to auto-upgrade schema-incompatible fields
4. Run `skaffold diagnose` to surface all validation issues at once

Example fix

// before (skaffold.yaml line 12)
image: Registry/MyImage:latest
// after
image: registry.example.com/myimage:latest

// Parse and lint skaffold.yaml against the schema before use
parsed, err := schema.ParseConfig([]byte(cfgYAML), version)
if err != nil {
    return fmt.Errorf("invalid skaffold.yaml at line %d: %w", lineOf(err), err)
}

if err := process(config); err != nil {
    // message includes "source: file, id on line L column C"
    return fmt.Errorf("skaffold validation: %w", err)
}

When it happens

Trigger: Any validation error from Process/validateImageNames/validateKubectlManifests whose errs[i].Location has a valid StartLine (not -1) — i.e. errors traceable to a specific token in the parsed config file.

Common situations: Typo'd field names or bad values at a known line of skaffold.yaml; invalid image repository names; kubectl manifest paths failing validation; hand-edited skaffold.yaml with schema violations.

Understand the failure class

Background: Schema validation failed / invalid input schema: payload rejected because its shape doesn't match the expected schema — this error's family across 28 libraries.

Related errors

• source: %s, %s
• cannot add an empty image value
• response must be a number, or empty
• strings.Join(messages, "\n")
• strings.Join(messages, " \n ")

AI-assisted analysis of GoogleContainerTools/skaffold@a1189de023 (2026-09-05). Data as JSON: /api/errors/a1d58f0408b2374a. Report an issue: GitHub.