ERROR: SECRETS "KIALI" NOT FOUND

Error: secrets "kiali" not found

add below ,

$ echo -n 'admin' | base64
YWRtaW4=
$ echo -n '1f2d1e2e67df' | base64
MWYyZDFlMmU2N2Rm
$ cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Secret
metadata:
  name: kiali
  namespace: $NAMESPACE
  labels:
    app: kiali
type: Opaque
data:
  username: YWRtaW4=
  passphrase: MWYyZDFlMmU2N2Rm
EOF

Source:

https://github.com/istio/istio/blob/44798c747a5a4483bafc810c35e568494d78cc99/install/kubernetes/helm/istio/README.md