Error text when required fields are not filled (form)

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I working on a custom form where I want an error text to show if they do not fill the required fields.

The ErrorText1 is hidden on load.

export function Nextbutton2_onclick(event, $w, reject) {
if ($w(‘#Q1’).value)
if ($w(‘#Q2’).value)
if ($w(‘#Q3’).value)
{
$w(“#form”).changeSlide(2);
} else {
$w(‘#ErrorText1’).show();
$w(‘#Nextbutton2’).disable()
setTimeout (function ()
{ $w(‘#Nextbutton2’).enable()
},2000)

}
}

The error text is not popping up. Am I missing something here?