Google Spreadsheet -> Google Calendar [errors, & code help] - google-apps-script

Question

I've been using a script to pull data from a Google Spreadsheet and use that info to populate a Google Calendar. It works for the most part, but is very unstable: sometimes it does not work, and most times it generates an error, even if it does work.
One error I get a lot is "Cannot find method createAllDayEvent(string,number,object). (line 39, file "")", which, of course, does not make much sense, as that is a known valid method.
Below is my code: I would be super grateful to anyone who can help me tweak it to be a bit more reliable:
Thanks,
Sterling
function SpreadsheetToCalendar()
{
// This function should be executed from the spreadsheet you want to export to the calendar
var mySpreadsheet = SpreadsheetApp.getActiveSheet();
// These 2 methods do the same thing. Using the 2nd one, as 1st is deprecated
// var myCalendar = CalendarApp.openByName("Autodesk Renewals");
var myCalendar = CalendarApp.getCalendarById("rfx.com_bp79fdqvbortgmv21bj8am4hjc#group.calendar.google.com");
// optional - delete existing events
var events = myCalendar.getEvents(new Date("January 1, 2013 PST"),
new Date("December 31, 2016 PST"));
for (var i = 0; i < events.length; i++)
{
events[i].deleteEvent();
Utilities.sleep(300); // pause in the loop for 300 milliseconds
}
var dataRange = mySpreadsheet.getRange("A2:H300");
var data = dataRange.getValues();
// process the data
for (i in data)
{
var row = data[i];
// assume that each row contains a date entry and a text entry
var theContract = row[0] ;
var theDate = row[2] ;
var theCustomer = row[3] ;
var theAssign = row[5] ;
var theStatus = row[6] ;
var theNotes = row[7] ;
//var theTitle = (theCustomer + " | " + theContract + " | " + theAssign + " | " + theStatus);
var theTitle = ("| " + theCustomer + " | " + theContract + " | " + theAssign + " | " + theStatus + " |");
//myCalendar.createAllDayEvent(theTitle, theDate);
// myCalendar.createAllDayEvent(theTitle, new Date(date));
myCalendar.createAllDayEvent(theTitle, theDate, {description:theNotes});
Utilities.sleep(300); // pause in the loop for 300 milliseconds
}
}

Answer 1

as for the specific error regarding createAllDayEvent, note that each parameter has a type. your code is not validating that the cell from row[2] has a valid date and instead its passing a number, which is not expected.
you are also doing a for..in.. on an array which is bad (google it. tldr you will loop on the "count" property too.)