AWS CodePipeline throwing error "Missing required parameter in pipeline.stages[0]: "name""

I am trying to create a CICD of my application that is available on Bitbucket. For this, I have created AWS CodePipeline that will deploy this app to ECS Cluster. I am trying to do this via AWS CLI. Here is my JSON file:

{
    "pipeline": {
        "roleArn": "arn:aws:iam::xxxxxxxxxxxx:role/service-role/AWSCodePipelineServiceRole-us-east-1-HubspotConnector",
        "stages": [{
                "Name": "Source",
                "Actions": [{
                    "InputArtifacts": [],
                    "ActionTypeId": {
                        "Version": "1",
                        "Owner": "AWS",
                        "Category": "Source",
                        "Provider": " "
                    },
                    "OutputArtifacts": [{
                        "Name": "SourceArtifact"
                    }],
                    "RunOrder": 1,
                    "Configuration": {
                        "ConnectionArn": "arn:aws:codestar-connections:us-east-1:7xxxxxxxx3930:connection/5bxxxx2-257f-4xxxxx0-xxx3-edfdsfsdf7d672f",
                        "FullRepositoryId": "rxxxxxh/hubspotcctorpipeline",
                        "BranchName": "main",
                        "OutputArtifactFormat": "CODE_ZIP"
                    },
                    "Name": "ApplicationSource"
                }]
            },
            {
                "name": "Build",
                "actions": [{
                    "inputArtifacts": [{
                        "name": "SourceArtifact"
                    }],
                    "name": "Build",
                    "actionTypeId": {
                        "category": "Build",
                        "owner": "AWS",
                        "version": "1",
                        "provider": "CodeBuild"
                    },
                    "outputArtifacts": [{
                        "name": "default"
                    }],
                    "Configuration": {
                        "ProjectName": "cicdCli"
                    },
                    "runOrder": 1
                }]
            },
            {
                "Name": "DeployECS",
                "ActionTypeId": {
                    "Category": "Deploy",
                    "Owner": "AWS",
                    "Provider": "ECS",
                    "Version": "1"
                },
                "RunOrder": 2,
                "Configuration": {
                    "ClusterName": "my-ecs-cluster",
                    "ServiceName": "sample-app-service",
                    "FileName": "imagedefinitions.json",
                    "DeploymentTimeout": "15"
                },
                "OutputArtifacts": [],
                "InputArtifacts": [{
                    "Name": "my-image"
                }]
            }
        ],
        "artifactStore": {
            "type": "S3",
            "location": "codepipeline-us-east-1-1xxx5xxxx29"
        },
        "name": "newPipelineCicd",
        "version": 1
    }
}

Here is the error I am facing:

Can Someone describe me what I am doing wrong? I have searched for these errors but didn't get any help from anywhere. Also no one have written any tutorial or proper guide for this. I have found AWS documentation, one of the complexest documentations. Please guide me here.I would really appreciate that.