GmailThread.getlables() 随机失败，并出现异常“异常：不允许 Gmail 操作”。

Question

这可能很奇怪，但我有一些代码可以通过我的电子邮件并使用标签来触发某些任务。例如，如果有人通过 Indeed 申请，Indeed 会向我发送一封电子邮件。过滤器将看到此电子邮件并应用“Applications/indeedApplication”标签。然后，每分钟运行一次的脚本会找到这个标签，并根据该标签自动执行一些操作。

大约 99.97% 的情况下这都可以正常工作。该脚本运行没有问题，并执行任务，应用已完成的标签，一切都按预期进行。0.03% 的时间，任务会失败，总是在同一点，并且总是出现相同的异常：

例外：不允许 Gmail 操作。

当脚本尝试在 GmmailThread（GmailApp API 的类）上运行 getLables() 函数时，它会失败。

有问题的代码：

function addICandidate() {
  var label = GmailApp.getUserLabelByName("Applications/indeedApplication");   //Defines the label that identifies indeed applicatoins

  var requests = label.getThreads();                    //Returns an array of threads which have this label
  if(requests.length > 3){requests.length = 3};         //This makes it so the script doesn't waste time looking through every application ever.  

  for ( var i in requests ) {                           //Starting a normal for loop
    iLabels = requests[i].getLabels();                  //Gets the labels of the Randomly fails here and only here
    var checker = false;                                //used later to check if tasks were already completed
    for (var k = 0 in iLabels) {                        //Starting another normal for loop
      var individualLabel = iLabels[k].getName();       //Gets a list of the labels
      if (individualLabel === completedLabelName) {     //Checks if the label for completes tasks is present
        var checker = true;                             //If they are, set checker to true (also used later)
        }
      }
    if(checker){                                        //If the checker above is set to true
      Logger.log("true");                               //Do nothing (logger is just used in debugging)
    }
    else{                                               //Else (if the label is not completed and therefore, the tasks have not been done yet)
      var thread = requests[i].Dostuff();               //Confidential stuff lives here
 
      }
    requests[i].addLabel(completedlabel);               //After everything, apply the completed label so tasks are not done again on the next pass
    }
  }
}

有谁知道为什么它会在这里失败并且只有三千分之一的尝试。我显然无法用暴力来调试这个问题，所以任何关于为什么会发生这种情况的想法都会非常有帮助。