Nano Banana 2 (gemini-3.1-flash-image-preview) fails for a handful of predictable reasons. This guide identifies which error you have — 429 quota exhaustion, IMAGE_SAFETY content filtering, server overload, or API parameter mistakes — and gives you the exact fix steps for both Gemini app users and API developers.
Getting a 429 RESOURCE_EXHAUSTED error with free_tier_requests limit: 0 on your paid Gemini API account? This guide helps you diagnose whether it's a billing misconfiguration or a known Google bug, then walks you through the exact fix for each scenario — including workarounds for the Feb 2026 image generation bug.
Having trouble upgrading Gemini? This guide covers all 5 failure types — IDE, CLI, API, subscription, and mobile app — with step-by-step fixes verified for Gemini 3.1 Pro (February 2026). Identify your error in 30 seconds and resolve it in minutes.
Getting 'Google's server capacity has reached its limit'? This guide covers all three error types (429 rate limit, 429 capacity exhausted, 503 no capacity), verified February 2026 quota data, and 8 proven fix methods including tier upgrades, exponential backoff, and multi-provider fallback architecture.
The RESOURCE_EXHAUSTED error (HTTP 429) accounts for 70% of all Nano Banana Pro API failures. This guide provides production-ready Python and Node.js code for exponential backoff retry, model fallback chains, and cost optimization strategies to eliminate 429 errors permanently.