Not able to execute child pipeline in scale mode

We are following below docuement to run child pipeline in scale parallel steps.
Advanced Workflows with Parallel steps · Codefresh | Docs. Below is the sample code.

upgrade_pipeline version:
  type: freestyle
  stage: update
  arguments:
    PIPELINE_ID: 'blueprints/multi-repo-upgrader tool'
	  environment: 
	    - 'CF_REPO_OWNER="Github_Org"'
	    - 'CF_COMMIT_AUTHOR=$CF_COMMIT_AUTHOR'
	    - 'CF_COMMIT_MESSAGE=$CF_COMMIT_MESSAGE'
	    - 'SKIP_APPROVAL=true'
	    - 'DRYRUN_ONLY=${{DRYRUN_ONLY}}'
	    - 'BRANCH="test"'
	  scale:
	    upgrade-multi-repo-upgrader:
		  title: Upgrade pipeline version of Repo1
		  environment:
		    - 'CF_REPO_NAME="XXXXXXX"'
	    upgrade-hscmanishjainctr:
		  title: Upgrade pipeline version of Repo2
		  environment:
		    - 'CF_REPO_NAME="XXXXXXX"' 

Its giving me below error
####################################
Running plugin upgrade_pipeline version
Failed to prepare plugin. Validation error
should NOT have additional properties
keyword:additionalProperties
schema path: #/additionalProperties
params:
additionalProperty:scale
[SYSTEM]
Message Validation error
Documentation Link Steps · Codefresh | Docs
####################################Preformatted text

Hello @manishjainctr

It is hard to answer this question without knowning how you have implemented the upgrade_pipeline version plugin.

You need to ask the person that created it for the available options.

Alternatively please open an issue with us. Our support team will investigate. Be sure to include the Git repo that has the source code of this custom plugin.