写了一个云函数，调用后出现错误 ：

WAService.js:1 Uncaught (in promise) Error: errCode: -404011 cloud function execution error | errMsg: cloud.callFunction:fail requestID local_debug_b580f4c9-7026-40a5-a81b-ecf4814829b2, cloud function service error code -1, error message errCode: -501007 invalid parameters | errMsg: [InvalidParameter] Check request parameter fail. Please check your request, but if the problem cannot be solved, contact us.; ; at cloud.callFunction api;
    at new u (WAService.js:1)
    at d (WAService.js:1)
    at f (WAService.js:1)
    at Function.success (WAService.js:1)
    at WAService.js:1
    at C (WAService.js:1)
    at i.<anonymous> (WAService.js:1)
    at i.emit (WAService.js:1)
    at Rs (WAService.js:1)
    at WAService.js:1

云函数如下：

// 云函数入口文件
const cloud = require('wx-server-sdk')


cloud.init()
const db = cloud.database();
const command = db.command;


// 云函数入口函数
exports.main = async (event, context) => {
  const wxContext = cloud.getWXContext()
  if(!wxContext.OPENID){
    return {status: 'fail'}
  }
  let today = new Date().toLocaleDateString()
  let result;
  //限流
  await db.collection('t_map_request').where({
    userId: wxContext.OPENID,
    reqTime: command.and(command.gte(new Date(today+' 00:00:00')),command.lte(new Date(today+' 23:59:59')))
  }).get().then(res => {
    if(res.data.length>10000){
      result = {event, status: 'limit'}
    }
    if(res.data.length>2000){
      let runCount = 0;
      res.data.forEach(element => {
        if(element.bestPoi==null){
          runCount++;
        }
      });
      if(runCount>2){
        result = {event, status: 'wait'}
      }
    }
  })
  if(result!=null){
    return result;
  }
  //数据准备
  let points = event.points //数组
  let modes = event.modes //数组
  let time = event.time
  let type = event.type
  let reqTime = new Date()
  //数据入库
  await db.collection('t_map_request').add({
    data: {
      userid: wxContext.OPENID,
      locations: points,
      modes: modes,
      startTime: new Date(time+':00'),
      reqTime: reqTime
    }, success: res => {
      result = {event, status: 'success', id: res._id}
    }, fail: err => {
      result = {event, status: 'fail'}
    }
  });
  if(result==null){
    result = {event, status: 'success'}
  }
  return result;
}

调用：console.log(JSON.stringify(res));返回也为{}

commitForm: function(points,modes,startDate,type,openId){
    wx.showLoading('提交中...'); 
    let pointsStr = JSON.stringify(points);
    let modeStr = JSON.stringify(modes);
    console.log('进入表单提交，receiveRequest | points='+pointsStr
    +'&modes='+modeStr
    +'&time='+startDate
    +'&type='+type
    +'&userId='+openId);
    try {
      var res = wx.cloud.callFunction({
        name: 'receiveRequest',
        data: {
          points: points,
          modes: modes,
          time: startDate,
          type: type
        }
      });
      console.log(JSON.stringify(res));
      wx.hideLoading();
      if (res.result.status == 'limit'){
        console.log('结束表单提交:LIMIT');
        app.showToast('抱歉！今日达到上限，请明日再尝试', 2000);
      }else if(res.result.status == 'wait'){
        console.log('结束表单提交:WAIT');
        app.showToast('系统正在为您处理上一个请求，请稍后再提交', 2000);
      }else{
        console.log('结束表单提交:SUCCESS');
        wx.cloud.callFunction({
          name: 'handleRequest',
          data: {
            points: points,
            modes: modes,
            time: startDate,
            type: type
          }
        });
      }
      return true;
    }catch (err) {
      return false;
    }
  }