Alexa APi setup problem

Hi
when i test lamba funcation getting below error

START RequestId: ec3fed05-1b08-11e7-bcf0-1378d756cc43 Version: $LATEST
'header': KeyError
Traceback (most recent call last):
  File "/var/task/haaska.py", line 46, in event_handler
    name = event['header']['name']
KeyError: 'header'

also when i try to enable it ask for autorication is it normal ? i mena in mobile alexa app