Assign text to a text frame Indesign CS4 JC

Question

Hi,
I have a little challenge. I assigned text to a text frame many times, but the line wouldn't work now. Could you help me with it:
try{
var myNumber = app.activeDocument.selection[0];
if (myNumber instanceof Rectangle){
    myNumber.fillColor = "White";
catch (e){
alert ("Please create and select Rectangle");
exit();
myNumber.contentType = ContentType.TEXT_TYPE;
//myNumber = String ();
myNumber.contents = "mamma";
It wouldn't input my value into the frame (the pink line).
Thank you very much for your help.
Yulia

Answer 1

//Try this
if(app.selection.length>0){
    var myNumber = app.selection[0];
    try{
        if (myNumber instanceof Rectangle){
            myNumber.fillColor = "Paper";
    catch (e){
        alert ("Please create and select Rectangle");
        exit();
    myNumber.contentType = 1952412773;
    //Seems to have lost the reference to the Rectangle
    app.selection[0].texts[0].contents = "Test";
} else {
    alert("No items selected");