Try deleting your cluster tiller
kubectl get all --all-namespaces | grep tiller
kubectl delete deployment tiller-deploy -n kube-system
kubectl delete service tiller-deploy -n kube-system
kubectl get all --all-namespaces | grep tiller
Initialise it again:
helm init
Now add the service account:
kubectl create serviceaccount --namespace kube-system tiller
kubectl create clusterrolebinding tiller-cluster-rule --clusterrole=cluster-admin --serviceaccount=kube-system:tiller
kubectl patch deploy --namespace kube-system tiller-deploy -p '{"spec":{"template":{"spec":{"serviceAccount":"tiller"}}}}'
This solved my issue!