Unable to continue with install: PodSecurityPolicy: missing key "meta.helm.sh/release-namespace": must be set to "default"

[Dentrax]

What steps did you take and what happened:

1. $ helm repo add gatekeeper https://open-policy-agent.github.io/gatekeeper/charts --force-update
2. $ helm install gatekeeper/gatekeeper --generate-name --set experimentalEnableMutation=true --dry-run

Error: rendered manifests contain a resource that already exists. Unable to continue with install: PodSecurityPolicy "gatekeeper-admin" in namespace "" exists and cannot be imported into the current release: invalid ownership metadata; label validation error: missing key "app.kubernetes.io/managed-by": must be set to "Helm"; annotation validation error: missing key "meta.helm.sh/release-name": must be set to "gatekeeper-1618484158"; annotation validation error: missing key "meta.helm.sh/release-namespace": must be set to "default"

What did you expect to happen:
It should work? 🤔

Anything else you would like to add:
I was following the Deploying via Helm installation steps.

Environment:

• Gatekeeper version: v3.4.0
• Kubernetes version: (use kubectl version): C: v1.19.7, S: v1.20.2
• Helm version: version.BuildInfo{Version:"v3.5.3", GitCommit:"041ce5a2c17a58be0fcd5f5e16fb3e7e95fea622", GitTreeState:"dirty", GoVersion:"go1.16"}

[sozercan]

Sounds like you already have a non-Helm deployment of Gatekeeper in your cluster. I would suggest removing any existing components then deploy Gatekeeper using Helm.

[maxsmythe]

Closing this out, please re-open if the issue persists after following @sozercan's suggestion.