Why Does Gemini 2 Flash Return a No Response Error Despite Valid Node Output?

Based on the troubleshooting steps in the documentation, here are some points to check:

• Confirm the previous node’s output:
  Make sure the node immediately before your Gemini node is actually returning valid content. If it outputs a null or empty payload, the Gemini node won’t have data to work on.

• Verify your prompt and parameters:
  Ensure that your prompt (or any necessary input field) isn’t empty or malformed. If you’re using an expression to generate a prompt, double-check that it’s correctly referencing a valid field and actually returning content.

• Watch for upstream provider issues:
  Since you mentioned you’re using Gemini 2 Flash with multiple providers, keep in mind that the Gemini API can return service errors (like HTTP 503 or 504) when overloaded, when the input context is too large, or if there’s a timeout. For example:

  • An HTTP 503 error might indicate that the service is temporarily overloaded—try switching to a different Gemini model or wait and retry.
  • If a timeout occurs (HTTP 504), adjusting your client’s timeout setting might help.

• Network/Router configuration:
  If you’re running n8n behind a reverse proxy or with custom networking settings, verify that your network configuration isn’t causing connection issues between n8n and the Gemini API.

Taking these steps should help narrow down whether the issue lies with missing output from a previous node, input parameter problems, or with the Gemini service itself. If you continue to get no response, testing with a simplified node configuration or switching models may provide further clues.

Below is some troubleshooting guidance for this issue:

1. Verify Node Configuration
Ensure that your Google Gemini Chat Model node is configured correctly. Double‑check:

• The model you’re selecting is available for your account.
• All required parameters and node options (like Maximum Number of Tokens, Sampling Temperature, etc.) are properly set.

2. Check Credentials and Authentication
Make sure your credentials (whether OAuth2 or API key based, as applicable) are correctly configured for the Gemini Chat Model node. If authentication isn’t set up or authorized properly, the node might not return any output.

3. Confirm Node Execution
The message “[No response. Make sure the last executed node outputs the content to display here]” indicates that the node did not output any data. In your workflow:

• Confirm that the Gemini node is the last executed node.
• Review the execution details to see if any errors or warnings were logged.

4. Network and Provider Issues
If you’re using Gemini 2 Flash with Open Router or other Gemini providers, check:

• That your network configuration isn’t causing connectivity issues.
• Whether any provider-specific settings need to be adjusted. Some providers may require extra parameters or have different endpoint requirements.

If after verifying these points the issue persists, it might be a good idea to:

• Look at the node’s execution logs or error details for further clues.
• Reach out on the community forum or consult your Gemini provider’s documentation for any known issues with your current configuration.

Hopefully this helps pinpoint the cause behind the error you’re encountering.