Too many calendars or calendar events in a short time error

I have been using this script successfully for a long time, but about a month ago I started getting the error "You have been creating or deleting too many calendars or calendar events in a short time" I add one or two events once a day or even once a week. I do no changes in previous events, but still get this error. The script just stopped working.

Please, what can be done here?

function onOpen() {
  var sheet = SpreadsheetApp.getActiveSpreadsheet();
  var entries = [{
    name : "Export Events",
    functionName : "exportEvents"
  }];
  sheet.addMenu("Calendar Actions", entries);
};

/**
 * Export events from spreadsheet to calendar
 */
function exportEvents() {
  var sheet = SpreadsheetApp.getActiveSheet();
  var headerRows = 1;  // Number of rows of header info (to skip)
  var range = sheet.getDataRange();
  var data = range.getValues();
  var calId = "mail@gmail.com";
  var cal = CalendarApp.getCalendarById(calId);
  for (i=0; i<data.length; i++) {
    if (i < headerRows) continue; // Skip header row(s)
    var row = data[i];
    var date = row[0];
    var title = row[1];
    var tstart = row[2];
    tstart.setDate(date.getDate());
    tstart.setMonth(date.getMonth());
    tstart.setYear(date.getFullYear());
    var tstop = row[3];
    tstop.setDate(date.getDate());
    tstop.setMonth(date.getMonth());
    tstop.setYear(date.getFullYear());
    var loc = row[4];
    var desc = row[5];
    var id = row[6];              // Sixth column == eventId
    // Check if event already exists, update it if it does
    try {
      var event = cal.getEventSeriesById(id);
    }
    catch (e) {
      // do nothing - we just want to avoid the exception when event doesn't exist
    }
    if (!event) {
      //cal.createEvent(title, new Date("December 1, 2022 08:00:00"), new Date("December 1, 2022 09:00:00"), {description:desc,location:loc});
      var newEvent = cal.createEvent(title, tstart, tstop, {description:desc,location:loc}).getId();
      row[6] = newEvent;  // Update the data array with event ID
    }
    else {
      event.setTitle(title);
      event.setDescription(desc);
      event.setLocation(loc);
      // event.setTime(tstart, tstop); // cannot setTime on eventSeries.
      // ... but we CAN set recurrence!
      var recurrence = CalendarApp.newRecurrence().addDailyRule().times(1);
      event.setRecurrence(recurrence, tstart, tstop);
    }
    debugger;
  }
  // Record all event IDs to spreadsheet
  range.setValues(data);
}

Service invoked too many times in a short time: Calendar

Add the Utilities.sleep(1000) under the debugger.

This method can add a delay between each event creation/update.

Reference

• Exception message