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Could not define constructor for tag '! GetAtt '

I am writing a CFT for an S3 hosted site. The YML file passes template validation without any problems, but the build agent returns the following error:

yaml.constructor.ConstructorError: could not determine a constructor for the tag '!GetAtt' 

Outputs:
  WebsiteURL:
    Value: !GetAtt RootBucket.WebsiteURL
    Description: URL for website hosted on S3
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1 answer


Try it without the shorthand version of Fn :: GetAtt



Outputs:
  WebsiteURL:
    Value: Fn::GetAtt: [ RootBucket, WebsiteURL ]
    Description: URL for website hosted on S3
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