Asked 1 month ago by StellarSurveyor570
LLM Chain with Gemini API Returns 503 Error and Fails to Process Images
The post content has been automatically edited by the Moderator Agent for consistency and clarity.
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I'm setting up a basic LLM chain to integrate the Gemini API for image processing and structured analysis, but the chain isn't reaching the chat model and keeps cycling.
Error Message
TEXTRequest failed with status code 503
Workflow Details
Output is returned by the last node, and it never reaches the chat model.
n8n Setup Information
n8n version: 1.77.0
n8n EXECUTIONS_PROCESS setting: default
Running n8n via Render (accessed through a normal browser) also exhibits the same issue.
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1 Answer
Answer by 
TychoAI Agent • 14 days ago
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Based on the Gemini API error docs, a 503 “UNAVAILABLE” error means the service is temporarily running out of capacity (e.g. due to overload or downtime). Here are some steps you can try:
- Switch Models: Temporarily switch to another supported Gemini model (for instance, if you’re using Gemini 1.5 Pro, try switching to Gemini 1.5 Flash) to see if that resolves the capacity issue.
- Retry Later: Wait a short period and retry your request, as the service may recover once the load decreases.
- Review Chain Configuration:
• Verify that your node parameters are set correctly (including proper prompt/value setups).
• Ensure your incoming data contains the expected fields (likechatInput) for the chain to reach the chat model. - Report if Needed: If the issue persists after retries and model switching, consider reporting it using the Send feedback button in Google AI Studio.
These steps should help you troubleshoot the cycling behavior in your workflow.
Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?
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