mysql错误1054未知列？

I've been mashing away at tweaking a calendar event to prepare it so I can just have a user click add to calendar and it will fire off code for that (that much works) but I'm trying to add an end date to the event in the db and it's not having any of it when I try to insert it.

<?xml version="1.0"?>
<schema version="0.3">
<table name="dsEventCalendar">
    <field name="calendarID" type="I">
        <key/>
        <unsigned/>
        <autoincrement/>
    </field>
    <field name="title" type="C" size="255">
    </field>
</table>
<table name="dsEventCalendarEvents">
    <field name="eventID" type="I">
        <key/>
        <unsigned/>
        <autoincrement/>
    </field>
    <field name="calendarID" type="I">
        <unsigned/>
    </field>
    <field name="date" type="T">
    </field>
    <field name="type" type="C" size="255">
    </field>
    <field name="title" type="C" size="255">
    </field>
    <field name="description" type="X">
    </field>
    <field name="url" type="X">
    </field>
    <field name="endDate" type="X">
    </field>
    </table>
</schema>

and here's my php code that seems to fail

$this->post('event_title');
             $this->post('event_date');
             $this->post('event_location');
             $this->post('event_description');
             $this->post('event_url');
             $this->post('event_endDate');
             $sql = "INSERT INTO dsEventCalendarEvents(calendarID,title,date,type,description,url,endDate) VALUES (?,?,?,?,?,?,?)";
             $args = array(
                   $this->post('event_calendarID'),
                   $this->post('event_title'),
                   $this->post('event_date'),
                   $this->post('event_location'),
                   $this->post('event_description'),
                   $this->post('event_url'),
                   $this->post('event_endDate')
             );
             $db->Execute($sql, $args); //death, immediate death
             echo "killed";

If anyone could see the dumb mistake I'm probably creating that would be fantastic as I'm at a loss.