Fail to create kubernetes cluster in Google Cloud

Ran following command to create a cluster on Google Kubernetes Engine. Then I got below error.

Google Cloud Status Dashboard is green for GKE as of 10 AM July 22, 2020 (Eastern Daylight Savings Time).

Does anyone know what’s going on?

gcloud container clusters create demo 
  --cluster-version latest 
  --machine-type=n1-standard-2 
  --num-nodes 4 
  --zone us-east1-b

ERROR: (gcloud.container.clusters.create) Operation [<Operation
 clusterConditions: [<StatusCondition
 message: "[CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-4fv2' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-4fv2 to the constraint to use external IP with it.">, <StatusCondition
 message: "[CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-4gr4' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-4gr4 to the constraint to use external IP with it.">, <StatusCondition
 message: "[CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-f1fx' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-f1fx to the constraint to use external IP with it.">, <StatusCondition
 message: "[CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-g4br' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-g4br to the constraint to use external IP with it.">, <StatusCondition
 message: "Not all instances running in IGM after 27.672242329s. Expect 4. Current errors: [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-4fv2' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-4fv2 to the constraint to use external IP with it.; [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-4gr4' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-4gr4 to the constraint to use external IP with it.; [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-f1fx' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-f1fx to the constraint to use external IP with it.; [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-g4br' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-g4br to the constraint to use external IP with it.">]
 detail: "Not all instances running in IGM after 27.672242329s. Expect 4. Current errors: [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-4fv2' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-4fv2 to the constraint to use external IP with it.; [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-4gr4' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-4gr4 to the constraint to use external IP with it.; [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-f1fx' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-f1fx to the constraint to use external IP with it.; [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-g4br' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-g4br to the constraint to use external IP with it."
 endTime: '2020-07-22T13:50:22.491208073Z'
 name: 'operation-1595425781652-ad5953b3'
 nodepoolConditions: []
 operationType: OperationTypeValueValuesEnum(CREATE_CLUSTER, 1)
 progress: <OperationProgress
 metrics: [<Metric
 intValue: 6
 name: 'CLUSTER_DEPLOYING'>, <Metric
 intValue: 6
 name: 'CLUSTER_DEPLOYING_TOTAL'>]
 stages: []>
 selfLink: 'https://container.googleapis.com/v1/projects/230730309217/zones/us-east1-b/operations/operation-1595425781652-ad5953b3'
 startTime: '2020-07-22T13:49:41.652224299Z'
 status: StatusValueValuesEnum(DONE, 3)
 statusMessage: "Not all instances running in IGM after 27.672242329s. Expect 4. Current errors: [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-4fv2' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-4fv2 to the constraint to use external IP with it.; [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-4gr4' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-4gr4 to the constraint to use external IP with it.; [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-f1fx' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-f1fx to the constraint to use external IP with it.; [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-g4br' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-g4br to the constraint to use external IP with it."
 targetLink: 'https://container.googleapis.com/v1/projects/230730309217/zones/us-east1-b/clusters/demo'
 zone: 'us-east1-b'>] finished with error: Not all instances running in IGM after 27.672242329s. Expect 4. Current errors: [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-4fv2' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-4fv2 to the constraint to use external IP with it.; [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-4gr4' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-4gr4 to the constraint to use external IP with it.; [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-f1fx' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-f1fx to the constraint to use external IP with it.; [CONDITION_NOT_MET]: Instance 'gke-demo-default-pool-a53ea683-g4br' creation failed: Constraint constraints/compute.vmExternalIpAccess violated for project 230730309217. Add instance projects/hipster-shop-277101/zones/us-east1-b/instances/gke-demo-default-pool-a53ea683-g4br to the constraint to use external IP with it.