mudler/LocalAI · error

router/score: policy has empty label

Error message

router/score: policy has empty label

What it means

Construction-time panic in NewScoreClassifier: a ScorePolicy entry has an empty Label. Labels become the scored candidates (wrapped by buildCandidate) and the routing decision values, so an empty label breaks both scoring and dispatch.

Solutions

1. Give every policy a non-empty, unique label
2. Check the field name is exactly label
3. Validate the policies slice (labels and descriptions non-empty) at config load time

Example fix

# before (yaml)
policies:
  - description: "general conversation"
# after
policies:
  - label: chat
    description: "general conversation"

for i, p := range policies {
    if strings.TrimSpace(p.Label) == "" {
        return fmt.Errorf("policy %d: empty label", i)
    }
}

func validLabels(ps []ScorePolicy) bool { for _, p := range ps { if p.Label == "" { return false } }; return true }

When it happens

Trigger: A policies entry missing or blanking its label field; a zero-value ScorePolicy appended in Go; YAML key spelled differently (name instead of label).

Common situations: Hand-written policy lists where one block lost its label line; schema drift between router classifier types using different field names; config generated from a spreadsheet/CSV with an empty first column.

Related errors

• router/rerank: policy has empty label
• router/rerank: policy
• router/score: policy
• router/score: system_prompt_template
• router/rerank: at least one policy is required

AI-assisted analysis of mudler/LocalAI@44413a9d06 (2026-08-15). Data as JSON: /api/errors/79bd0df4e938b78c. Report an issue: GitHub.

Appendix: source

Thrown at core/services/routing/router/score.go:174

	// of a full option-list re-prefill.
	stablePrefixOnce sync.Once
	stablePrefix     string
}

// NewScoreClassifier panics on caller errors at construction (empty
// policies, missing description, nil scorer) — same rationale as the
// other classifiers. See ScoreClassifierOptions for the optional
// knobs and their zero-value defaults.
func NewScoreClassifier(policies []ScorePolicy, scorer backend.Scorer, opts ScoreClassifierOptions) *ScoreClassifier {
	if len(policies) == 0 {
		panic("router/score: at least one policy is required")
	}
	if scorer == nil {
		panic("router/score: scorer is required (configure router.classifier_model)")
	}
	for _, p := range policies {
		if p.Label == "" {
			panic("router/score: policy has empty label")
		}
		if p.Description == "" {
			panic(fmt.Sprintf("router/score: policy %q has no description", p.Label))
		}
	}
	labels := make([]string, 0, len(policies))
	for _, p := range policies {
		labels = append(labels, p.Label)
	}
	if opts.ActivationThreshold <= 0 {
		opts.ActivationThreshold = defaultActivationThreshold
	}
	if opts.StopToken == "" {
		opts.StopToken = defaultStopToken
	}
	if opts.PromptRenderer == nil {
		opts.PromptRenderer = chatMLRenderer
	}

View on GitHub (pinned to 44413a9d06)