Illustrator batch script only runs once and stops

Hi,

I am trying to get a batch script to process all the AI files in a selected folder but I can only get this script to process the first file in the folder.  I'm starting to learn Javascript but up to this point I only have the skills to find existing scripts online and combine them to get them to do what I need (you may recognize parts of the following code as coming from other peoples scripts).  Essentially, the following is what I'm trying to do:

• Open the first AI file in a designated folder
• Select the pathItems that have a RGB Green fill color
• Move those pathItems to a folder named "Layer NEW"
• Hide the "Layer New" layer
• Save the AI file
• Close the AI file
• Repeat until all the files in the folder are processed.

Any help would be appreciated.  

// It promts the user for the source folder and destination folder
// Opens an AI file, Selects all the RGB Green paths
// Moves the selected paths to the folder named 'Layer NEW'
// Hides 'Layer NEW'
// Saves the AI file and closes the file
// Looks to see if there is another AI file to process

var destFolder, sourceFolder, files, sourceDoc;


// Select the source folder.
sourceFolder = Folder.selectDialog( 'Select the folder with the AI 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("*.ai");

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

            // Select path item based on RGB swatch

            // This script does the same operation as "Select Same Fill Color"
            // does in Illustrator. Commented code as well for your help. It works
            // perfectly in Illustrator CC 2017


            var rgbCol = new RGBColor();

            rgbCol.red = 0;

            rgbCol.green = 255;

            rgbCol.blue = 0;

            sourceDoc.defaultFillColor = rgbCol;

            app.executeMenuCommand("Find Fill Color menu item");

            // This portion moves the selected items to a layer called 'Layer NEW'

            var layerName = 'Layer NEW';
            var _layer = sourceDoc.layers.getByName(layerName);
            var _selectedItems = app.selection;
            for (var i = _selectedItems.length - 1; i>=0; i--) {
                _selectedItems[i].move(_layer, ElementPlacement.PLACEATEND)
             ;
                _selectedItems[i].selected = false;
            }
            app.redraw();

            // LayerHideByName.jsx

            var myLayers = sourceDoc.layers;
            var HideName = "Layer NEW";
            try {
                HideLayer = myLayers.getByName (HideName);
                HideLayer.visible = false;
                redraw();
                }
            catch (e) {}
  
            // Save the AI file and close

            sourceDoc.save();
            sourceDoc.close();
		        }
		alert( 'Files are saved as AI in ' + destFolder );
	}
	else
	{
		alert( 'No matching files found' );
	}
}