B4J Question Library in debug mode not work

package com.rwblinn.rlstrings;

import anywheresoftware.b4a.BA;
import java.io.File;
import java.io.FileOutputStream;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
@BA.DesignerName("Build 20140101")
@BA.Version(0.10F)                                          
@BA.Author("PnK")     
@BA.ShortName("WordUtility") 
public class WordUtility {
   
    public void CreateBlankDocument(String dir,String fileName) throws Exception{
        String path = new String();
        path = dir+"/"+fileName;
        XWPFDocument document= new XWPFDocument();
        FileOutputStream out = new FileOutputStream(new File(path));
        document.write(out);
        document.close();
        out.close();
    }
   
    public static void main(String[] args) throws Exception {
        WordUtility word = new WordUtility();
        word.CreateBlankDocument("C:/Users/kdrills01/Desktop", "a.docx");
        System.out.println("createdocument.docx written successully");
       }
}

Sub Process_Globals
    Private fx As JFX
    Private word As WordUtility
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    word.CreateBlankDocument("C:/Users/xxxxx/Desktop","a.docx")
End Sub

'Return true to allow the default exceptions handler to handle the uncaught exception.
Sub Application_Error (Error As Exception, StackTrace As String) As Boolean
    Return True
End Sub