Lambda Kinesis stream event mapping

[Bharat K]

I am creating lambda trigger for kinesis stream however getting below error. 

"msg": "Module alias error: internal error: required and default are mutually exclusive for event_source"

Code: 

- hosts: control

  gather_facts: no

  vars:

    state: present

    function_names: from_Kinesis

  tasks:

  - name: Kinesis stream event mapping

    lambda_event:

      state: "{{ state | default('present') }}"

      event_source: stream

      function_name: "{{ function_names }}"

      source_params:

        source_arn: arn:aws:kinesis:us-west-2:xxxxxxxxxxx:stream/StockTradeStream

        enabled: True

        batch_size: 100

        starting_position: TRIM_HORIZON

  - name: show source event config

    debug: var=lambda_stream_events

Appreciate your input.

Thanks !!