Why do I have a yellow warning sign next to this code?

Updating some OLD code to the latest version of the SDK and I see a yellow warning sign next to this class.

And a warning

Class 'MyInputDelegate' does not initialize its super class, 'InputDelegate'

How can I stop this warning or should I care? Ta

class MyInputDelegate extends Ui.InputDelegate

{

var cd;




function onKey(evt)

{

if(evt.getKey() == Ui.KEY_ENTER)

{

if( scr == 4 )

{

scr = 1;

}

else

{

scr = scr + 1;

}

Ui.requestUpdate();

}

}