Why do I get a "Bad handler AWS Lambda - not enough values to unpack" error?

user_6737245 0
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I'm trying to execute a Lambda function but I get the following error:

{
  "errorMessage": "Bad handler 'AlertMetricSender': not enough values to unpack (expected 2, got 1)",
  "errorType": "Runtime.MalformedHandlerName",
  "stackTrace": []
}

My Lambda handler is specified in AlertMetricSender.py:

from modules.ZabbixSender import ZabbixSender
def lambda_handler(event, context):
    sender = ZabbixSender("10.10.10.10", 10051)
    sender.add("Zabbix server", "lambda.test", 5.65)
    sender.send()
aws-lambda amazon-web-services python-3.x python
1 Answers

This is normally caused by an incorrect value specified for the "Handler" setting for the Lambda function.

It is a reference to the method in your function code that processes events i.e. the entry point.

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The value of the handler argument is comprised of the below, separated by a dot:

  • The name of the file in which the Lambda handler function is located
  • The name of the Python handler function.

Make sure you have not missed the filename.

In this case, it looks like the handler should be set to AlertMetricSender.lambda_handler.

user_48003440
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