How do I fix my to make the drop down menu appears?

Here is my code below. I also have a trigger from spreadsheet on open but that doesn’t seem to work since the menu never shows up. I think something is missing but I can’t point out what.

Can someone please help?

function onOpen(){
  doc = DocumentApp.getActiveDocument();
  var menudrop = SpreadsheetApp.getUi();
  menudrop.createMenu('Refresh Reports');
  menudrop.createMenu.addItem('Refresh CO', 'copyClearPasteAUDashboard','combinedLive');
  menudrop.createAddonMenu.addItem('Refresh SW', 'copyClearPasteSWDashboard','combinedLive')
  menudrop.addToUi();
}