AWS Error ResourceNotFoundException: Lambda function not found

Error✕ Not retryable · fix the payloadHTTP 404 Not FoundAPI Gateway

TL;DR · 10-second read

The function, alias or version does not exist in that Region/account. Check AWS_REGION, the alias name and that the deploy finished.

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What you see · exact log / response

An error occurred (ResourceNotFoundException) when calling the Invoke operation: Function not found: arn:aws:lambda:us-east-1:123456789012:function:image-resize:prod

Fix

Being written

Copy-paste fixes for ResourceNotFoundException are in the enrichment queue

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Last verified 2026-10-10 · Source: botocore service models (errors per operation) · Official docs ↗ · ~2,900 searches/mo