步进功能触发循环

Question

我正在从Lambda启动step函数，并且Lambda函数绑定到API网关。由于某种原因，当我尝试测试Lambda函数时，我看到数百次执行失败并循环运行。我刚刚触发了一次步进功能。我在这里错过了一些东西。你能请教吗？

const AWS = require("aws-sdk");
const uuidv4 = require("uuid/v4");
/*----------------------------------------------------------------------- */
/* Implementation                                                         */
/*----------------------------------------------------------------------- */
exports.handler = async event => {

  var _dt = await ExecuteStepFunction()
  return _dt;
}

function ExecuteStepFunction() {
  const stepFunctions = new AWS.StepFunctions();
  return new Promise((res, rej) => {
    var params = {
      stateMachineArn: 'arn:aws:states:us-east-1:xxxxxxxxxxxxx:stateMachine:xxTestSateMachine',
      input: JSON.stringify(''),
      name: uuidv4()
    };
    stepFunctions.startExecution(params, function (err, data) {
      if (err) {
        rej(err);
      }
      else {
        res(data);
      }
    });
  });
}

我尝试了此链接（https://docs.aws.amazon.com/step-functions/latest/dg/tutorial-api-gateway.html）中提供的这种方法，其中API网关直接触发了步进功能，但我收到以下错误。尝试解决此问题后，我转到使用API​​启动功能的上述选项。

{
  "__type": "com.amazon.coral.service#UnrecognizedClientException",
  "message": "The security token included in the request is invalid"
}