CloudFormation: Deployment error

Question

I am developing Lambda (NET6) and have added Github Action: build, upload and deploy.
Now the 1 & 2 work fine, but the Deploy step completed with error:
Run aws cloudformation deploy --template-file ./aws/cfn/pm2customers-lambda.yml --stack-name pm2customers-lambda-apigw --parameter-overrides \
  aws cloudformation deploy --template-file ./aws/cfn/pm2customers-lambda.yml --stack-name pm2customers-lambda-apigw --parameter-overrides \
      Application=pm2customer-lambda-apigw \
      Environment=dev \
      LambdaName=lambda \
      LambdaHandler=pm2aws \
      LambdaBucketName=pm2customer-lambda-apigw-bucket \
      LambdaZipFile=pm2customerlambda-77612e3d34a8acf9ba2620beea4ffaab77a005aa.zip \
      --capabilities CAPABILITY_IAM
     
  shell: /usr/bin/bash -e {0}
  env:
    APPLICATION_PACKAGE: pm2customerlambda
    APPLICATION_NAME: pm2customer-lambda-apigw
    LAMBDA_BUCKET_NAME: pm2customer-lambda-apigw-bucket
    SLN_WORKING_DIR: .
    AWS_DEFAULT_REGION: eu-west-2
    AWS_REGION: eu-west-2
    AWS_ACCESS_KEY_ID: ***
    AWS_SECRET_ACCESS_KEY: ***

An error occurred (ValidationError) when calling the CreateChangeSet operation: Stack:arn:aws:cloudformation:eu-west-2:***:stack/pm2customers-lambda-apigw/dc4c4710-2489-11ee-b6be-0a649fe12144 is in ROLLBACK_COMPLETE state and can not be updated.
Error: Process completed with exit code 254.

What should I fix ?

Answer

Hi, ValidationError means that your file pm2customers-lambda.yml is incorrect in its syntax or structure.
You should install cfn-lint to check it and find what wrong it.

To install cfn-lint: see https://github.com/aws-cloudformation/cfn-lint

Also, you can go to the AWS console for CFN and check the events for your failed stack: you should find your stack in ROLBACK_COMPLETE state and may be able to spot the incorrect part of your yaml in the Events tab

Hope it helps!
Didier

CloudFormation: Deployment error

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