Invalid User ID Specified When Trying to Remove Message

This is my first time to use Apps Scripts. I am only using this on my personal email account. I am trying to use a script that I came across on StackOverflow that is supposed to permanently delete emails with specific words that are in my spam folder. I have tested the code and it seems to correctly find the emails based on the text that I specify.

My problem is that I cannot get it perform the actual deletion of the emails. I think that I am not specifying my email address correctly. In my code example, I used me. I have also tried hard coding my email, but that did not work.

When I try to execute the code, it gives me the following error: "GoogleJsonResponseException: API call to gmail.users.messages.delete failed with error: Invalid user id specified in request/Delegation denied at deleteForever(Code:17:29)

What is the proper way to reference my personal email account?

function setTrigger() {
  ScriptApp.newTrigger('deleteForever')
  .timeBased()
  .everyMinutes(1)
  .create()
}

function deleteForever() {

  var threads = GmailApp.search("in:spam");

  for (var i = 0; i < threads.length; i++) {
    var msg = threads[i].getMessages()[0];
    console.log(i)
    if (msg.getPlainBody().match(/truck|car|(you won)/gi) !== null){
        console.log('Found It!')
       Gmail.Users.Messages.remove(me, threads[i].getId.toString()); 
    }

  }
}

SUGGESTION

Based on your code, here are the problems:

1. You are using me in your Gmail.Users.Messages.remove() as a variable that is non-existing, thus causing the Invalid user id error.
2. You also need to use the message ID instead of the threads[i] ID as required on the id parameter of the users.messages.delete method.

Tweaked Script

function deleteForever() {

  var threads = GmailApp.search("in:spam");

  for (var i = 0; i < threads.length; i++) {
    var msg = threads[i].getMessages()[0];
    console.log(i)
    if (msg.getPlainBody().match(/truck|car|(you won)/gi) !== null){
        console.log('Found It!')
       Gmail.Users.Messages.remove('me', msg.getId()); 
    }

  }
}

Demo

After running the script:

>

In your script, the variable me is undefined. And undefined is not a valid "userId". me should be the string "me".

Gmail.Users.Messages.remove("me", threads[i].getId.toString());