could not complete the action, since the destination folder does not exist

Try using this script instead of using a action step to do the saving. It will create a folder named "Resized" in the original path of the file, and then save the file in PNG with the current document dimensions and name.

// Check if a document is open
if (app.documents.length > 0) {
    // Set the active document
    var doc = app.activeDocument;

    // Get the original file path
    var originalPath = doc.path;

    // Create the "Resized" folder within the original file's location
    var resizedFolder = new Folder(originalPath + "/Resized");
    if (!resizedFolder.exists) {
        resizedFolder.create();
    }

    // Define the output PNG file name (keeping the same name as the original file)
    var outputFileName = doc.name.replace(/\.[^\.]+$/, "") + ".png";

    // Define the full path of the output file
    var outputPath = resizedFolder + "/" + outputFileName;

    // Save the document as a PNG file in the "Resized" folder
    doc.saveAs(new File(outputPath), new PNGSaveOptions());
}

Perhaps it would help to illustrate your problem with a screenshot of the action panel with any save or export step expanded and wide enough to be fully visible. Also a screenshot of the batch or other settings too.