Release pipeline fails at Promote Helm Release step

[spaily]

I'm running JX in my On-Premises cluster.

step-promote-helm-release
WARNING: no $GIT_SECRET_MOUNT_PATH environment variable set
step-promote-helm-release
releasing chart nodejs
step-promote-helm-release
error: failed to create chart release in dir charts/nodejs: failed to add remote repo: failed to run 'helm repo add --username admin --password ***** release-repo http://bucketrepo.jx.svc.cluster.local/bucketrepo/charts' command in directory 'charts/nodejs', output: 'Error: looks like "http://bucketrepo.jx.svc.cluster.local/bucketrepo/charts" is not a valid chart repository or cannot be reached: error unmarshaling JSON: while decoding JSON: json: cannot unmarshal string into Go value of type repo.IndexFile'