How to enable pipeline deployment feature properly?

Question

I signup for the Alpha program and in repo navigation I got deployment button also the Alpha lable in my pipeline page. But when I push commit it throws error.

And this is my pipeline configuration...

# Messenger Webhook CI configuration.
# -----
# Right now these pipelines for the deployments. Only master.
image: python:3.6.3

pipelines:
 branches:
 master:
 - step:
 name: Build and test chalice based app
 caches:
 - pip
 script:
 - pip install pipenv --upgrade
 - pipenv install --dev --deploy --system
 - pytest tests/

- step:
 name: Testing
 deployment: test
 script:
 - pip install -r vendor.txt -t vendor/ --upgrade
 - chalice deploy --no-autogen-policy

Simon_zs6tr2 · Accepted Answer

I was wrong I have to format correctly...

# Fiobot Messenger Webhook CI configuration.
# -----
# Right now these pipelines for the deployments. Only master.
image: python:3.6.3

pipelines:
 branches:
 master:
 - step:
 name: Build and test chalice based app
 caches:
 - pip
 script:
 - pip install pipenv --upgrade
 - pipenv install --dev --deploy --system
 - pytest

- step:
 name: Testing
 deployment: test
 script:
 - pip install -r vendor.txt -t vendor/ --upgrade
 - chalice deploy --no-autogen-policy