异常：无效参数：continuationToken

我正在尝试使用“工作示例（线性迭代器）”来实现一个简单的延续令牌这个帖子 https://stackoverflow.com/questions/45689629/how-to-use-continuationtoken-with-recursive-folder-iterator，但我不断收到“异常：无效参数：continuationToken”错误，不知道如何解决此问题。

我尝试将 var userProperties 和 var continuationToken 从全局移动到我的 deleteFile() 内，但仍然不行。调试器还显示 userProperties 填充了数据，但 continuationToken 始终为 null（就在错误之前）。也不知道为什么它总是跳到 else 情况而失败，即使是在第一次运行时也是如此。

const sheetID = "IDgoeshere"; //sheet with ids and user names 
const sheetName = 'Sheet1' //name of the sheet in the doc
const emailID = Session.getActiveUser().getEmail();
var userProperties = PropertiesService.getUserProperties();
var continuationToken = userProperties.getProperty('CONTINUATION_TOKEN');

function deleteFile() {
  const spreadsheet = SpreadsheetApp.openById(sheetID);
  const sheet = spreadsheet.getSheetByName(sheetName);
  const lastRow = sheet.getLastRow();
  const values = sheet.getRange(2, 4, lastRow - 1, 3).getValues();
  values.forEach((row, index) => {
    const owner = row[0];
    const id = row[2];
    if (continuationToken == null) {  
      if (emailID == row[1]) {
        try {
          var file = DriveApp.getFileById(row[2])
          if (file.isTrashed == true) {
            console.info('was trashed');
            row++;
          }
          else {
            file.setTrashed(true);
          }
        }
        catch (e) {
          console.info(`Unable to find file with id ${id}`);
        }
      }
      else {
        // not the first time, pick up where we left off
        var files = DriveApp.continueFileIterator(continuationToken); ***//errors out here***
      }
    }
    while (files.hasNext() && end.getTime() - start.getTime() <= maxTime) {
      var file = files.next();
      Logger.log(file.getName());
      end = new Date();
    }

    if (files.hasNext()) {
      var continuationToken = files.getContinuationToken();
      userProperties.setProperty('CONTINUATION_TOKEN', continuationToken);
    }
    else {
      // Delete the token
      PropertiesService.getUserProperties().deleteProperty('CONTINUATION_TOKEN');
    }
});
}

这是一个人为的例子：

function myfunk1(token) {
  const folder = DriveApp.getFolderById(gobj.globals.testfolderid);
  let files;
  if(token == null) {
    files = folder.getFiles();
  } else {
    Logger.log('get continuaton token')
    files = DriveApp.continueFileIterator(token);
  }
  while(files.hasNext) {
    let file = files.next();
    Logger.log(file.getName());
    if(!token ) {
      try {
        myfunk1(files.getContinuationToken())
      }
      catch{
        return;
      }
    }
  }
}

在此示例中，我只是中断了迭代器的处理，并使用延续标记递归地调用该函数一次。