I'm getting an invalid field selector error when I try and create my deployment using a YAML file. The error is error validating data: found invalid field selector for v1.PodSpec and my file can be seen below.

apiVersion: apps/v1beta1
kind: Deployment
metadata:
 name: zalenium-deployment
spec:
 replicas: 1
 template:
  metadata:
   labels:
    app: zalenium
  spec:
   serviceAccountName: zalenium
   serviceAccount: zalenium
   selector:
    app: zalenium
    role: grid
   containers:
    - name: zalenium-pod
      image: dosel/zalenium
      ports:
      - containerPort: 4444
        protocol: TCP
      volumeMounts:
      - name: zalenium-shared
        mountPath: /tmp/mounted
      - name: zalenium-videos
        mountPath: /home/seluser/videos
      resources:
       requests:
        memory: "250m"
        cpu: "500m"
       limits:
        memory: "1Gi"
   volumes:
   - name: zalenium-shared
     persistentVolumeClaim:
      claimName: zalenium-shared-claim
   - name: zalenium-videos
     persistentVolumeClaim:
      claimName: zalenium-videos-claim

I have tried using online YAML File Validator and they don't seem to show anything wrong with the format. When I try and create the Deployment above with the validate=false flag, the deployment runs, but then the pods continuously crash and restart (crashLoopBackOff). What should I be looking into? I'm still getting familiar with k8s but from the error I would assume it had something to do with the container specs in my deployment. Any tips on approaching this? Thanks!