CODEWITHSUNDEEP
aws-lambdayamlaws-serverless
Hari
Hari

Reputation: 151

Getting following error on serverless.yaml :can not read a block mapping entry; a multiline key may not be an implicit key

I am trying to deploy the lambda function along with the serverless.yml file to AWS, but it throw below error

The following is the function defined in the YAML file

functions:
 s3-thumbnail-generator:
 handler:handler.s3_thumbnail_generator  
   events:
     - s3:
       bucket: ${self:custom.bucket}
       event: s3.ObjectCreated:*
       rules:
       - suffix: .png

plugins:
  - serverless-python-requirements

Error I am getting:

can not read a block mapping entry; a multiline key may not be an implicit key in serverless.yml" at line 45, column 10:

I would need to understand how to fix this issue in YAML file in order to deploy to the function to AWS?

Upvotes: 12

Views: 49234

Answers (2)

superkeci
superkeci

Reputation: 171

If it is your original file there is a syntax error in your YAML file. I added a note under the line of possible error:

functions:
 s3-thumbnail-generator:
 handler:handler.s3_thumbnail_generator  
   events:
     - s3:
       bucket: ${self:custom.bucket}
       event: s3.ObjectCreated:*
       rules:
       - suffix: .png
       ^^^ this line should be indented one level

plugins:
  - serverless-python-requirements

Upvotes: 0

Anthon
Anthon

Reputation: 76832

The problem is that there is no value indicator (:) at the end of the line:

handler:handler.s3_thumbnail_generator

so the parser continues to try and gather a multi-line plain scalar by adding events followed by a value indicator. But a multi-line plain scalar cannot be a key in YAML.

It is unclear what your actual error is. It might be that you need to add the value indicator and have a colon emmbedded in your key:

functions:
 s3-thumbnail-generator:
 handler:handler.s3_thumbnail_generator:
   events:
     - s3:
       bucket: ${self:custom.bucket}
       event: s3.ObjectCreated:*
       rules:
       - suffix: .png

plugins:
  - serverless-python-requirements

Or it could be that that colon should have been a value indicator (which usually needs a following space) and you were sloppy with indentation:

functions:
  s3-thumbnail-generator:
  handler: handler.s3_thumbnail_generator  
  events:
     - s3:
       bucket: ${self:custom.bucket}
       event: s3.ObjectCreated:*
       rules:
       - suffix: .png

plugins:
  - serverless-python-requirements

Upvotes: 7

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