Error aplicando deployment

O deployment de 5:05 está dando erro: error: error validating "sistema-noticias-deployment.yaml": error validating data: ValidationError(Deployment.spec.template.spec.containers[0].envFrom[0]): unknown field "name" in io.k8s.api.core.v1.EnvFromSource; if you choose to ignore these errors, turn validation off with --validate=false

apiVersion: apps/v1
kind: Deployment
metadata:
  name: sistema-noticias-deployment
spec:
  replicas: 1
  template:
    metadata:
      name: sistema-noticias
      labels:
        app: sistema-noticias
    spec:
      containers:
        - name: sistema-noticias-container
          image: aluracursos/sistema-noticias:1
          ports:
            - containerPort: 80
          envFrom:
            - configMapRef:
              name: sistema-configmap
  selector:
    matchLabels:
      app: sistema-noticias

Qual seria o bug? O configmap está presente:

λ kubectl.exe get configmap
NAME                DATA   AGE
db-configmap        4      20h
portal-configmap    1      20h
sistema-configmap   4      20h