create service using cloudformation in aws ecs fargate "did not stabilize" - aws-cloudformation

Question

AWSTemplateFormatVersion: "2010-09-09"
Description: Not Have Any Idea
Parameters:
Service:
Description: Service Name
Type: String
Cluster:
Description: Cluster Name
Type: String
TaskDefinition:
Description: TaskDefinition Name
Type: String
securitygroup:
Description: securitygroup
Type: AWS::EC2::SecurityGroup::Id
SubnetId:
Type: List<AWS::EC2::Subnet::Id>
Description: Select at two subnets in your selected VPC.
Resources:
sernginx:
Type: "AWS::ECS::Service"
Properties:
ServiceName:
Ref: Service
LaunchType: "FARGATE"
DesiredCount: 1
Cluster:
Ref: Cluster
TaskDefinition:
Ref: TaskDefinition
DeploymentConfiguration:
MaximumPercent: 200
MinimumHealthyPercent: 70
NetworkConfiguration:
AwsvpcConfiguration:
AssignPublicIp: ENABLED
SecurityGroups:
- Ref: securitygroup
Subnets:
Ref: SubnetId
I am using this code to create aws ecs service fargate
I am getting ROLLBACK_COMPLETE status with an error message saying
Service arn:aws:ecs:us-east-1:439138162442:service/yuiyiuyiu did not stabilize

Answer 1

I've used this kind of template for creating fargate task.
AWSTemplateFormatVersion: '2010-09-09'
Description: Docker Core App service
Parameters:
EnvironmentName:
Type: String
Default: coreapp
Description: A name for the environment that this cloudformation will be part of.
ServiceName:
Type: String
Default: coreapi
Description: A name for the service
ImageUrl:
Type: String
Default: your_image_URI
Description: The url of a docker image
ContainerPort:
Type: Number
Default: 5000
Description: What port number the application inside the docker container
ContainerCpu:
Type: Number
Default: 256
Description: How much CPU to give the container.
ContainerMemory:
Type: Number
Default: 512
Description: How much memory in megabytes to give the container
DesiredCount:
Type: Number
Default: 2
Description: How many copies of the service task to run
Role:
Type: String
Default: ""
Description: (Optional) An IAM role to give the service's containers
Resources:
Service:
Type: AWS::ECS::Service
Properties:
ServiceName: !Ref 'ServiceName'
Cluster:
- coreapp
LaunchType: FARGATE
DeploymentConfiguration:
MaximumPercent: 200
MinimumHealthyPercent: 75
DesiredCount: !Ref 'DesiredCount'
NetworkConfiguration:
AwsvpcConfiguration:
AssignPublicIp: ENABLED
SecurityGroups:
- sg-483aa03e
Subnets:
- subnet-2ce41866
- subnet-ceefe5aa
TaskDefinition: !Ref 'TaskDefinition'