Kubeval fails for validation

here is sample service file,

```
apiVersion: v1
kind: Service
metadata:
creationTimestamp: null
labels:
app: httpd
name: INVALID-e_f
spec:
ports:
- port: 8080
targetPort: 80
selector:
app: httpd
type: INVALID
status:
loadBalancer: {}
```
after running kubeval, it shows valid, but it's not

```
$ kubeval service.yml
The document docker-compose.yml contains a valid Service
```