Apache Flink

I'm referring ArgoCd integration of flink kubernetes operator: <https://nightlies.apache.org/flink/flink-kubernetes-operator-docs-release-1.6/docs/operations/helm/#working-with-argo-cd>, but getting error: `rpc error: code = Unknown desc = `helm pull --destination /tmp/db8cdd15-426c-4aa9-b1c5-c7796158f9aa --version 1.6.0 --repo <https://github.com/apache/flink-kubernetes-operator> flink-kubernetes-operator` failed exit status 1: Error: looks like "<https://github.com/apache/flink-kubernetes-operator>" is not a valid chart repository or cannot be reached: failed to fetch <https://github.com/apache/flink-kubernetes-operator/index.yaml> : 404 Not Found`

My Manifest
```project: data-engineering
destination:
  server: '<https://kubernetes.default.svc>'
  namespace: data-engineering
syncPolicy:
  automated:
    prune: true
    selfHeal: true
sources:
  - repoURL: '<https://github.com/apache/flink-kubernetes-operator>'
    path: helm/flink-kubernetes-operator
    targetRevision: 1.6.0
    helm:
      valueFiles:
        - $values/qa/data-engineering-flink-k8-operator/values.yaml
      releaseName: flink-kubernetes-operator
    chart: flink-kubernetes-operator```