Strange error message when generating dynamic iCalendar events

I am using PHP to generate iCalendar events using data from a MySQL DB.  To my eye, the .ics file it generates is well formed, but I keep getting an import error that says "This error can appear if you have attempted to save a recurring Lunar appointment in iCalendar format. To avoid this error, set the appointment option to Gregorian instead of Lunar."  I can not figure out what's wrong.  Below is the code, attached is a sample .ics file that this code generates (in txt format due to upload restrictions).  Any help would be appreciated, thanks!

<?php
    header("Content-Type: text/Calendar");
    header("Content-Disposition: inline; filename=sample.ics");
	
	include_once("config.inc");
	include_once("display-functions.inc");
 
	$intTrainingID=$_REQUEST['id'];
 
	$qr="SELECT * FROM tblTrainingClasses WHERE intTrainingID='$intTrainingID'";
	$result=odbc_exec($dbconn, $qr) or die ("Could not execute query...".obdc_errormsg($dbconn));
  	$intUserID=odbc_result($result,"intUserID");
  	
  	$datClassEnd=odbc_result($result,"datClassEnd");
  	$datRequest=odbc_result($result,"datRequest");
 
	$vCalStart = date("Ymd", strtotime($datClassStart))."T090000";
	$vCalEnd = date("Ymd", strtotime($datClassEnd))."T180000";
?>
BEGIN:VCALENDAR<?="\r\n"?>
PRODID:-//Microsoft Corporation//Outlook 10.0 MIMEDIR//EN<?="\r\n"?>
VERSION:2.0<?="\r\n"?>
METHOD:REQUEST<?="\r\n"?>
BEGIN:VEVENT<?="\r\n"?>
DTSTAMP:<?php echo $vCalStart . "Z\r\n"; ?>
DTSTART:<?php echo $vCalStart . "Z\r\n"; ?>
DTEND:<?php echo $vCalEnd . "Z\r\n"; ?>
SUMMARY:<?php echo "sample summary\r\n"; ?>
DESCRIPTION:<?php echo "sample description will be filled in later\r\n"; ?>
UID:123<?="\r\n"?>
X-MICROSOFT-CDO-IMPORTANCE:1<?="\r\n"?>
PRIORITY:3<?="\r\n"?>
CLASS:PUBLIC<?="\r\n"?>
END:VEVENT<?="\r\n"?>
END:VCALENDAR

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sample.txt