title: yaml syntax issues? can not read a block mapping entry; a multiline key may not be an implicit keyYAML
body: <p>I'm having the following syntax error in my yaml &quot;can not read a block mapping entry; a multiline key may not be an implicit key&quot;</p>
  <p>not sure i'm why my array values are causing issues.</p>
  <pre><code>service: my-app
  
  package:
    individually: true
  
  provider:
    name: aws
    runtime: python3.8
    region: us-east-1
    stage: dev
  
  functions:
    app:
      package:
        include:
          - &quot;main.py&quot;
        exclude:
          - &quot;requirements.txt&quot;
          - &quot;package.json&quot;
          - &quot;package-lock.json&quot;
          - &quot;.serverless/**&quot;
          - &quot;.virtualenv/**&quot;
          - &quot;node_modules/**&quot;
      handler: main.handler
      environment:
        STAGE: ${self:provider.stage}
      layers:
        - { Ref: PythonRequirementsLambdaLayer }
      events:
        - http:
            method: any
            path: /{proxy+}
  
  plugins:
    - serverless-python-requirements
  
  custom:
    pythonRequirements:
      dockerizePip: true
      layer:
        name: app-layer
        description: app-layer
        compatibleRuntimes:
          - python3.8
  </code></pre>