App is undefined... Help

Hello all,

Recently, I am using the Adobe LiveCycle to create a form with a countdown. I keep receiving a error of "App is undefined" under the Log tab in report window.

Great if someone can give me some clue on this as my colleague has left a sample for me to test and it works fine. But when I copy the code to a new file to try replicating the result but did not work at all.

Thanks,
Oli

The code is as below:

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timer_test::ready:form - (JavaScript, client)

xfa.form.timer_test.variables.countdown.value = "90";

var second = 1000;

timer_test.page_01.timer_text.rawValue = xfa.form.timer_test.variables.countdown.value;
dummy = app.setInterval("xfa.form.timer_test.variables.timer.DoTimers()", second);

timer_test.#variables[0].timer - (JavaScript, client)
 
function ClockProc(nCurTime)
{
xfa.form.timer_test.variables.countdown = String(Number(xfa.form.timer_test.variables.countdown.value)-1);
if (Number(xfa.form.timer_test.variables.countdown.value) <= 0)
{
timer_test.page_01.timer_text.rawValue = "time out";
timer_test.page_01.timer_text.font.fill.color.value = "255,0,0";
}
else
{
timer_test.page_01.timer_text.rawValue = xfa.form.timer_test.variables.countdown.value;
}
}

function DoTimers()
{
ClockProc();
}
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