ArgoCD Helm chart - Repository not accessible - kubernetes-helm

Question

I'm trying to add a helm chart (https://github.com/prometheus-community/helm-charts/tree/main/charts/kube-prometheus-stack) to ArgoCD.
When I do this, I get the following error:
Unable to save changes: application spec is invalid: InvalidSpecError: repository not accessible: repository not found
Can you guys help me out please? I think I did everything right but it seems something's wrong...
Here's the Project yaml.
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
name: prom-oper
namespace: argocd
spec:
project: prom-oper
source:
repoURL: https://prometheus-community.github.io/helm-charts
targetRevision: "13.2.1"
path: prometheus-community/kube-prometheus-stack
helm:
# Release name override (defaults to application name)
releaseName: prom-oper
version: v3
values: |
... redacted
directory:
recurse: false
destination:
server: https://kubernetes.default.svc
namespace: prom-oper
syncPolicy:
automated: # automated sync by default retries failed attempts 5 times with following delays between attempts ( 5s, 10s, 20s, 40s, 80s ); retry controlled using `retry` field.
prune: false # Specifies if resources should be pruned during auto-syncing ( false by default ).
selfHeal: false # Specifies if partial app sync should be executed when resources are changed only in target Kubernetes cluster and no git change detected ( false by default ).
allowEmpty: false # Allows deleting all application resources during automatic syncing ( false by default ).
syncOptions: # Sync options which modifies sync behavior
- CreateNamespace=true # Namespace Auto-Creation ensures that namespace specified as the application destination exists in the destination cluster.
# The retry feature is available since v1.7
retry:
limit: 5 # number of failed sync attempt retries; unlimited number of attempts if less than 0
backoff:
duration: 5s # the amount to back off. Default unit is seconds, but could also be a duration (e.g. "2m", "1h")
factor: 2 # a factor to multiply the base duration after each failed retry
maxDuration: 3m # the maximum amount of time allowed for the backoff strategy
and also the configmap where I added the helm repo
apiVersion: v1
kind: ConfigMap
metadata:
labels:
app.kubernetes.io/name: argocd-cm
app.kubernetes.io/part-of: argocd
name: argocd-cm
namespace: argocd
data:
admin.enabled: "false"
repositories: |
- type: helm
url: https://prometheus-community.github.io/helm-charts
name: prometheus-community

Answer 1

The reason you are getting this error is because the way the Application is defined, Argo thinks it's a Git repository instead of Helm.
Define the source object with a "chart" property instead of "path" like so:
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
name: prom-oper
namespace: argocd
spec:
project: prom-oper
source:
repoURL: https://prometheus-community.github.io/helm-charts
targetRevision: "13.2.1"
chart: kube-prometheus-stack
You can see it defined on line 128 in Argo's application-crd.yaml