Script not working

Hello, I'm starting to learn Javascript. I am trying to get a batch script to process all the EPS files in a selected folder and save them to a new folder. But when I start the script I saw only an issue that Layer 1 was not found.

Here is the code:

var destFolder, sourceFolder, files, sourceDoc;

// Select the source folder.
sourceFolder = Folder.selectDialog( 'Select the folder with the eps files that you want to remove the green on', '~' );

// If a valid folder is selected
if ( sourceFolder != null )
{
files = new Array();

// Get all files matching the pattern
files = sourceFolder.getFiles("*.eps");

if ( files.length > 0 )
{
// Get the destination to save the files
destFolder = Folder.selectDialog( 'Select the folder where you want to save the finished eps files.', '~' );
for ( i = 0; i < files.length; i++ )
{
sourceDoc = app.open(files[i]); // returns the document object

}
}
}
function main() {

var layerName = "Layer 1";
try {
var _layer = doc.layers[layerName];
} catch (e) {
alert("No layer exists with name " + layerName);
}
app.executeMenuCommand("deselectall");
var _pageItems = doc.pageItems;
for (var i = 0; i < _pageItems.length; i++) {
if (
_pageItems[i].stroked &&
_pageItems[i].strokeColor.red == 230 &&
_pageItems[i].strokeColor.blue == 0 &&
_pageItems[i].strokeColor.green == 126
) {
_pageItems.selected = true;
break;
}
}
app.executeMenuCommand("Find Stroke Color menu item");
var _allItems = app.selection;
for (var i = 0; i < _allItems.length; i++) {
_allItems[i].move(_layer, ElementPlacement.PLACEATEND);
}

// Save the EPS file and close

sourceDoc.save();
sourceDoc.close();
}

main();