Java method invoke error

Encountering an issue when invoking a Java method. I have implemented Java code successfully for adding a signature image to a PDF. It functioned well when executed via the command prompt, but when attempting to integrate it into UiPath using Java activities,I encounter an error: “Invoke Java Method: One or more errors occurred. (The method could not be invoked.)” Provided below are sample input files and also following this blog Learn Rpa Uipath.

package pdfmanipulate;

//Adding Image, Date and Text in Existing PDF using Java

//Importing iText libraries
import java.text.SimpleDateFormat;
import java.util.Date;

import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;

 * How To Read And Add Image, Date and Text To Existing Pdf Example
 * modify the pdf, Using iText library in core java
public class PdfImageAdder {
    public static void main(String inputFilePath, String outputFilePath, String imagePath, String text) throws Exception {

        OutputStream fos = new FileOutputStream(new File(outputFilePath));

        PdfReader pdfReader = new PdfReader(inputFilePath);
        PdfStamper pdfStamper = new PdfStamper(pdfReader, fos);

        //Image to be added in existing pdf file.
        Image image = Image.getInstance(imagePath);
        image.scaleAbsolute(50, 20); //Scale image's width and height
        image.setAbsolutePosition(60, 43); //Set position for image in PDF

        // Font for text
        Font font = FontFactory.getFont(FontFactory.HELVETICA, 12, Font.NORMAL, BaseColor.BLACK);

        // Date to be added in existing pdf file
        Date date = new Date();
        SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
        String formattedDate = dateFormat.format(date);

        // loop on all the PDF pages
        // i is the pdfPageNumber
        for (int i = 1; i <= pdfReader.getNumberOfPages(); i++) {
            //getOverContent() allows you to write pdfContentByte on TOP of existing pdf pdfContentByte.
            //getUnderContent() allows you to write pdfContentByte on BELOW of existing pdf pdfContentByte.
            PdfContentByte pdfContentByte = pdfStamper.getOverContent(i);

            // add image

            // add text
            ColumnText.showTextAligned(pdfContentByte, Element.ALIGN_LEFT, new Phrase(text, font), 70, 38, 0);
            // add date
            ColumnText.showTextAligned(pdfContentByte, Element.ALIGN_LEFT, new Phrase(formattedDate, font), 70, 60, 0);
            System.out.println("Image, Date and Text added in "+outputFilePath);

        System.out.println("Modified PDF created in >> "+ outputFilePath);