GAS sorting does not work: TypeError: Function getRange not found in object 1680.

TypeError—Function getRange not found on object 1680.
  (line 5, file "Original 2") Do not display

function A(){
  var spreadsheet = SpreadsheetApp.getActiveSpreadsheet();
  var origin=spreadsheet.getSheetByName('Original 2');
  var origin_last_row = origin.getLastRow();
  origin_last_row.getRange(2,1,origin_last_row-1).sort([1,2,12]);
}