pot-app/pot-desktop · error · Error

Language not supported

Error message

Language not supported

What it means

handleSpeak in the Translate window's SourceArea throws this plain Error when the auto-detected source language is not a key in the selected TTS plugin's language map (ttsPluginInfo.language). The plugin only exposes TTS voices for the languages listed in that map, so any detected code outside it (e.g. auto-detected 'zh-CN' when the plugin only registers 'zh') cannot be spoken. It is an application-level guard, thrown before invoke_plugin is called.

Source

Thrown at src/window/Translate/components/SourceArea/index.jsx:189

            detect_language(sourceText).then(() => {
                syncSourceText();
            });
        }
        if (event.key === 'Escape') {
            appWindow.close();
        }
    };

    const handleSpeak = async () => {
        const instanceKey = ttsServiceList[0];
        let detected = detectLanguage;
        if (detected === '') {
            detected = await detect(sourceText);
            setDetectLanguage(detected);
        }
        if (getServiceSouceType(instanceKey) === ServiceSourceType.PLUGIN) {
            if (!(detected in ttsPluginInfo.language)) {
                throw new Error('Language not supported');
            }
            const pluginConfig = serviceInstanceConfigMap[instanceKey];
            let [func, utils] = await invoke_plugin('tts', getServiceName(instanceKey));
            let data = await func(sourceText, ttsPluginInfo.language[detected], {
                config: pluginConfig,
                utils,
            });
            speak(data);
        } else {
            if (!(detected in builtinTtsServices[getServiceName(instanceKey)].Language)) {
                throw new Error('Language not supported');
            }
            const instanceConfig = serviceInstanceConfigMap[instanceKey];
            let data = await builtinTtsServices[getServiceName(instanceKey)].tts(
                sourceText,
                builtinTtsServices[getServiceName(instanceKey)].Language[detected],
                {
                    config: instanceConfig,

View on GitHub (pinned to 594d32ede9)

Solutions

1. Switch to a TTS service (plugin or builtin) that supports the detected language, in Preferences > Service Config > TTS.
2. Check the plugin's supported language list and update the plugin to a version that registers the detected language code.
3. Set the source language manually instead of auto-detect so the detected code matches a key in ttsPluginInfo.language.
4. Catch the error in handleSpeak and surface a friendly notification instead of an unhandled rejection.

Example fix

// before
if (!(detected in ttsPluginInfo.language)) {
    throw new Error('Language not supported');
}
// after
if (!(detected in ttsPluginInfo.language)) {
    toast.error(`TTS plugin does not support language: ${detected}`);
    return;
}

const detected = detectedLanguage || await detect(sourceText);
if (getServiceSouceType(instanceKey) === ServiceSourceType.PLUGIN &&
    !(detected in ttsPluginInfo.language)) {
  // skip TTS or pick another service
  return false;
}
return true;

try { await handleSpeak(); } catch (e) {
  if (e.message === 'Language not supported') {
    toast.error('The TTS service does not support the detected language');
  } else throw e;
}

When it happens

Trigger: User clicks speak on the source text while the active TTS service is a PLUGIN-type instance; detected (auto-detected via detect() or previously cached via setDetectLanguage) is '' -missing- or not a key of ttsPluginInfo.language[serviceName].

Common situations: Auto language detection returns a code variant the plugin doesn't declare (e.g. 'zh-TW' vs 'zh', 'en-GB' vs 'en'); the TTS plugin simply lacks support for that language; a stale cached detected value no longer matches plugin config after the plugin was updated/reconfigured.

Related errors

• Language not supported

AI-assisted analysis of pot-app/pot-desktop@594d32ede9 (2026-09-02). Data as JSON: /api/errors/2c015e2994933ec9. Report an issue: GitHub.