Yaml isues on guidance-stack.yml

[YecineA]

Hello,
Tried to load the guidance-stack.yml CFN, got an error message on line 108, col 42 :

Template format error
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Parser error

missed comma between flow collection entries (108:41)

105 | ... etName: !Sub
106 | ... lattice-ingress-codepipeline-${AWS::Region}-${AWS::AccountId} ...
107 | ... RandomizedValue:
108 | ... Fn::Select: [0, Fn::Split: [-, Fn::Select: [2, Fn::Split: [ ...
------------------------------------------^
109 | ... ssControl: Private
110 | ...

by

  BucketName: !Sub 
    - lattice-ingress-codepipeline-${AWS::Region}-${AWS::AccountId}-${RandomizedValue}
    - RandomizedValue: 
        !Select 
          - 0
          - !Split 
            - '-'
            - !Select 
              - 2
              - !Split 
                - '/'
                - !Ref AWS::StackId