谷歌脚本触发器未触发

function getMessagesWithLabel() {

 var destArray = new Array();
 var label= GmailApp.getUserLabelByName('Personal/Testing');
 var threads = label.getThreads(0,2);

  for(var n in threads){
        var msg = threads[n].getMessages();
        var body = msg[0].getPlainBody();
        var destArrayRow = new Array();
        destArrayRow.push('thread has '+threads[n].getMessageCount()+' messages');
          for(var m in msg){
                     destArrayRow.push(msg[m].getPlainBody());
           }
  destArray.push(destArrayRow);           
        }
Logger.log(destArray);
var ss = SpreadsheetApp.getActiveSpreadsheet();
var sh = ss.getActiveSheet();
if(ss.getLastRow()==0){sh.getRange(2,1).setValue('getMessagesWithLabel() RESULTS')};
sh.getRange(2,1,destArray.length,destArray[0].length).setValues(destArray);


}