I got a bit of a problem.

i created a googlesheet and included a script, like this, to send it as a pdf to my email address:

function onOpen() {
  var ui = SpreadsheetApp.getUi();
  // Or DocumentApp or FormApp.
  ui.createMenu('Custom Menu')
  .addItem('Send summary', 'menuItem1')
  .addSeparator()      
  .addItem('Send summary&Week', 'menuItem2')
  .addToUi();
}

function menuItem1() {

var source   = SpreadsheetApp.getActiveSpreadsheet();
var subject  = source.getSheets()[9].getRange('G1').getValue(); //cell for              subject in sheet
var body     = source.getSheets()[9].getRange('F1').getValue(); 
var sheetNumSummary = 9; // first sheet(tab) is zero, second sheet is 1, etc..

var source = SpreadsheetApp.getActiveSpreadsheet();
var thema = source.getSheets()[9].getRange('f3').getValue();  // 
var mailTo = ('youremailaddress@here.com'); //source.getSheets()        [0].getRange('D1').getValue(); // 'D1' cell which consists an emailaddress.
var name = source.getSheets()[9].getRange('G1').getValue(); // Name of              Attachement
var sheets = source.getSheets();
sheets.forEach(function (s, i) {
    if (i !== sheetNumSummary) s.hideSheet();
});
var url = Drive.Files.get(source.getId())
    .exportLinks['application/pdf'];
url = url + '&size=letter' + //paper size
    '&portrait=false' + //orientation, false for landscape
    '&fitw=true' + //fit to width, false for actual size
    '&sheetnames=false&printtitle=false&pagenumbers=false' + //hide optional
    '&gridlines=false' + //false = hide gridlines
    '&fzr=false'; //do not repeat row headers (frozen rows) on each page
var token = ScriptApp.getOAuthToken();
var response = UrlFetchApp.fetch(url, {
    headers: {
        'Authorization': 'Bearer ' + token
    }

now comes the weird thing. I'm able to use it with the Google sheet i used it with, but if i do a copy of it and use the script from the menue i get the message:

Access Not Configured. The API (Drive API) is not enabled for your project. Please use the Google Developers Console to update your configuration.

I checked everything in the admin and developer console, but couldn't find anything. I also activate:

Two-legged OAuth access control Allow access to all APIs The key and secret above are able to access any user's data for all Google Data APIs. Learn more

If i leave the copy of the 1st sheet and deactivate the API access, the 1st sheet (the origin) doesn't work anymore with the script and i get the above alert message. I have to delete the copy, reactivate the API access to make it work again. So, somehow i guess, the copy is working with the a script that only allows to work with one Project Sheet and not with the copy of that sheet. Is there somehow a way to make it work? Or, how can i add/attach the script to the copy. I used this script: function getSpreadsheetKey() { return SpreadsheetApp.getActiveSpreadsheet().getId(); };

and saw that it gives me the google key from the original sheet. that might be the reason why i cant use the script with the copy of the google sheet. But i still don't know how wire it correctly.