AttributeError: 'yaml._yaml.Mark' object has no attribute '__dict__' using cfn-lint and vscode-cfn-lint (VSCode)

 

• CloudFormation Linter fo VS Code: https://marketplace.visualstudio.com/items?itemName=kddejong.vscode-cfn-lint

• AWS CloudFormation Linter (CLI): https://github.com/aws-cloudformation/cfn-lint

I had an extra ! in a !GetAtt. The error went away when I deleted the extra !.