Functions have the ability to notify AWS Lambda in case it failed to execute correctly. This is primarily done by the function passing the error object to Lambda which converts the same to a string and returns it to the user as an error message.
The error messages that are returned also depend on the invocation type of the function; for example, if your function performs a synchronous execution (the RequestResponse invocation type), then the error is returned back to the user and displayed on the AWS Management Console as well as in the CloudWatch Logs. For any asynchronous executions (the event invocation type), Lambda will not return anything. Instead it logs the error messages to CloudWatch Logs.
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