alibaba/nacos · error · IllegalArgumentException

Invalid label: {label}

Error message

Invalid label: {label}

What it means

Error "Invalid label: {label}" thrown in alibaba/nacos.

Source

Thrown at api/src/main/java/com/alibaba/nacos/api/ai/utils/AgentValidationUtils.java:162

     */
    public static void validateProtocolVersion(String protocolVersion) {
        if (protocolVersion == null || protocolVersion.isEmpty()
            || protocolVersion.length() > MAX_PROTOCOL_VERSION_LENGTH) {
            throw new IllegalArgumentException("Invalid protocolVersion: " + protocolVersion);
        }
        validatePrintableAscii(protocolVersion, "protocolVersion");
    }
    
    /**
     * Validate a version label, including the server-managed {@code latest} label.
     *
     * @param label version label
     * @throws IllegalArgumentException when invalid
     */
    public static void validateLabel(String label) {
        if (label == null || label.length() > MAX_LABEL_LENGTH
            || !LABEL_PATTERN.matcher(label).matches()) {
            throw new IllegalArgumentException("Invalid label: " + label);
        }
    }
    
    /**
     * Validate a client-writable version label.
     *
     * @param label version label
     * @throws IllegalArgumentException when invalid or reserved
     */
    public static void validateNonLatestLabel(String label) {
        validateLabel(label);
        if ("latest".equals(label)) {
            throw new IllegalArgumentException("The latest label is server-managed");
        }
    }
    
    /**
     * Validate a transport token without changing its case.

View on GitHub (pinned to 9b989acdf1)

Solutions

1. Correct the invalid value for label validation to match the expected format or allowed set, then retry.

When it happens

Trigger: Thrown at api/src/main/java/com/alibaba/nacos/api/ai/utils/AgentValidationUtils.java:162 when the library encounters an invalid state.

Common situations: Binding or updating a version label that fails the label syntax rules.

AI-assisted analysis of alibaba/nacos@9b989acdf1 (2026-08-14). Data as JSON: /api/errors/9d2b8a92573e6025. Report an issue: GitHub.