I am a total GCP Newbie- just created a new account.
I have installed a GKE cluster - it is active, also downloaded the sdk. I was able to deploy a pod on GKE using kubectl.
Have tiller and helm client installed.
From the CLI when I try running a helm command

>helm install --name testngn ./nginx-test


 Error: release testngn failed: namespaces "default" is forbidden: User  
"system:serviceaccount:kube-system:default" cannot get resource "namespaces" in API group "" in the namespace "default"

I have given my user "owner" role - so hopefully that is not the issue. But not sure how the CLI identifies the user and permissions (new to me). Also the kubectl -n flag does not work with helm (?)