'Create service' for a Cluster with Ec2 type is giving error in AWS console - amazon-ecs

Question

Trying out sample ECS with EC2 type in AWS free tier.
Created a Cluster for ec2 instance.
Then created task-def for ec2 resources with image uri - public.ecr.aws/ubuntu/nginx:latest, OS : Linux/X86_64, image t2.micro.
While creating/deploying the service, getting error on selecting the task-def created.
There was an error deploying nginx-service
Resource handler returned message: "Error occurred during operation 'ECS Deployment Circuit Breaker was triggered'." (RequestToken: 1ab71394-b41e-190a-df10-6a87d62a7915, HandlerErrorCode: GeneralServiceException)
task-def-json
{
"taskDefinitionArn": "arn:aws:ecs:ap-northeast-1:930446195568:task-definition/ecs-task-def:1",
"containerDefinitions": [
{
"name": "nginx",
"image": "public.ecr.aws/ubuntu/nginx:latest",
"cpu": 0,
"portMappings": [
{
"name": "nginx-80-tcp",
"containerPort": 80,
"hostPort": 80,
"protocol": "tcp",
"appProtocol": "http"
}
],
"essential": true,
"environment": [],
"environmentFiles": [],
"mountPoints": [],
"volumesFrom": []
}
],
"family": "ecs-task-def",
"executionRoleArn": "arn:aws:iam::930446195568:role/ecsTaskExecutionRole",
"networkMode": "bridge",
"revision": 1,
"volumes": [],
"status": "ACTIVE",
"placementConstraints": [],
"compatibilities": [
"EC2"
],
"requiresCompatibilities": [
"EC2"
],
"cpu": "512",
"memory": "1024",
"runtimePlatform": {
"cpuArchitecture": "X86_64",
"operatingSystemFamily": "LINUX"
},
"registeredAt": "2023-02-15T17:11:45.596Z",
"registeredBy": "arn:aws:iam::930446195568:user/admin_user",
"tags": []
}