创建管道时，'ParameterOverrides”属性在CloudFormation中无效。

此问题可能是由于管道中使用的模板的语法错误或格式不正确导致的。为解决此问题，您可以检查模板的语法和格式。此外，您还可以使用以下代码示例来解决此问题：

在AWS管道中使用json模板时，需要将yaml格式的模板转化为json格式，并将其放入S3存储桶中。在'CreatePipeline” API请求中使用以下代码示例：

{
"pipeline": {
  "name": "MyPipeline",
  "roleArn": "arn:aws:iam::1234567890:role/MyRole",
  "artifactStore": {
    "type": "S3",
    "location": "s3://mybucket/myfolder"
  },
  "stages": [
    {
      "name": "Source",
      "actions": [
        {
          "name": "MySourceAction",
          "actionTypeId": {
            "category": "Source",
            "owner": "ThirdParty",
            "provider": "GitHub",
            "version": "1"
          },
          "configuration": {
            "Owner": "MyOrg",
            "Repo": "MyRepo",
            "Branch": "master",
            "OAuthToken": "{{MyOAuthToken}}"
          },
          "outputArtifacts": [
            {
              "name": "MyApp1_Source"
            }
          ],
          "runOrder": 1
        }
      ]
    },
    {
      "name": "Build",
      "actions": [
        {
          "name": "MyBuildAction",
          "actionTypeId": {
            "category": "Build",
            "owner": "AWS",
            "provider": "CodeBuild",
            "version": "1"
          },
          "configuration": {
            "ProjectName": "{{MyCodeBuildProject}}"
          },
          "inputArtifacts": [
            {
              "name": "MyApp1_Source"
            }
          ],
          "outputArtifacts": [
            {
              "name": "MyApp1_Build"
            }
          ],
          "runOrder": 1
        }
      ]
    }
  ]
},
"template": {
  "bucket": "mybucket",
  "key": "myfolder/mytemplate.json",
  "version": "1"
},
"parameterValues": {
  "MyOAuthToken": "abc123",
  "MyCodeBuildProject": "MyBuildProject"
}
}

此示例将json格式的模板文件'mytemplate.json”放入S3存储桶'mybucket / myfolder”中，并在管道的'template”属性中引用