Unable to create CPU and Memory for deployment

Question

apiVersion: apps/v1
kind: Deployment
metadata:
  name: re-tbt-webservices1
spec:
  replicas: 1
  selector:
    matchLabels:
      app: re-tbt-webservices1
  template:
    metadata:
      labels:
        app: re-tbt-webservices1
    spec:
      containers:
        - name: re-tbt-webservices
          image: crReDevSouthindiaAks.azurecr.io/re-tbt-webservices:latest          
          ports:
            - containerPort: 8080
          resources:
            requests:
              cpu: '2'
              memory: 8G
            limits:
              cpu: '2'
              memory: 8G