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How to create a script or code to pull labelled email in gmail to drop box.

I get this error: ReferenceError: "DocsList" is not defined. (line 13, file "Code")

function send_Gmail_as_PDF() {

  var gLabel = "send_gmail_as_PDF";
  var thread = GmailApp.search("label:" + gLabel);
  for (var x = 0; x < thread.length; x++) {
    var messages = thread[x].getMessages();

    for (var y = 0; y < messages.length; y++) {
      var attach = messages[y].getAttachments();
      var body = messages[y].getBody();

      // Create an HTML File from the Message Body
      var bodydochtml = DocsList.createFile('body.html', body, "text/html")    /***ERROR ON LINE 13 ***/
      var bodyId = bodydochtml.getId()

      // Convert the HTML to PDF
      var bodydocpdf = bodydochtml.getAs('application/pdf').getBytes();

      var body_to_send = {
        fileName: 'body.pdf',
        content: bodydocpdf,
        mimeType: 'application/pdf'

      var attachmentList = [];

      // Trash the temporary file