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Error messages appear in your interface language. This page quotes them as they appear in the English interface. Raw error messages from the model provider, such as HTTP 429: ..., are not translated.

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Deployment and access

The server has no valid DEEPSEEK_API_KEY or GEMINI_API_KEY, and no key is entered in the browser settings either.
  • Docker: After editing .env.production, run docker compose up -d to recreate the container.
  • Vercel: After adding the variable under Settings → Environment Variables, redeploy.
  • Local development: After editing .env.local, restart npm run dev.
The app uses DeepSeek by default. Open Settings, switch AI provider to Gemini, then click Save settings.
Your cloud provider’s security group or the system firewall hasn’t opened the port. Open 3002, or open 80 and 443 after you set up a reverse proxy.
The domain doesn’t point to the server yet, or port 80 isn’t open. Confirm that the A record has taken effect, then try again.
In production, the session cookie has the Secure flag and can only be saved over HTTPS. Set up HTTPS for your site. Changing CODE also invalidates all existing sessions.

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Analysis and translation

Turn off Streaming output in Settings to get the complete result all at once. If you use an Nginx reverse proxy, also make sure you set proxy_buffering off.
The tokens the model returned don’t join back into the original text. Analyze it again, or switch to another model version.
The output exceeded the model’s length limit. Shorten the text, or analyze it in several parts.
The model provider didn’t respond within 60 seconds. Check the network between your server and the model provider, then try again later.
Streaming output received no new content for more than 90 seconds. Analyze the text again. If this happens often, turn off Streaming output in Settings.
Select those words. If the app determines that they form one word, click Merge into one word. For details, see Word details and multi-word selection.

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Other features

The server has no usable API key, or its outbound network can’t reach the model provider, so the app is using the 7 built-in backup sentences. The sentence of the day uses only the server key, never keys entered in the browser.
Gemini TTS requires a Gemini API key. Set GEMINI_API_KEY on the server, or enter a Gemini key in Settings. You can also switch back to Edge TTS, which needs no key.
Your browser has local storage disabled or is in private browsing mode. Use a regular window, or allow the site to store data.

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Report an issue

If none of the above solves your problem, open an issue on GitHub. When you report an analysis problem, include:
  • The model provider and model version
  • The interface language
  • The original text that reproduces the problem
Don’t paste API keys or access passwords into issues.