Web Reference: Nov 18, 2025 · This error occurs when Lambda cannot locate the specified handler function in your deployment package, bringing your function to a halt. In this blog, we’ll demystify this error, break down its root causes, and provide a step-by-step troubleshooting guide to resolve it. Nov 22, 2016 · In the case of the above error message, I attempted to call the handler method of index.js, but the corresponding method could not be found. The processing to call is set with "Handler" on the configuration tab. Below is an example of setting to call the handler method of index.js. This page describes how to work with Lambda function handlers in Python, including naming conventions, valid handler signatures, and code best practices.
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