can't compile sketch with ketai, oscp5 and external Jar ! weird

hi all. weird stuff here. I use jcifs to make samba connection (jar is placed in code folder). My problem is the compiler stops when I import ketai.ui.* and oscp5.* library... Can you reproduce this issue ? It's weird...when I just import ketai.ui.*ui, the compiler works just fine. output of processing compiler: Converting compiled files and external libraries into C:\Users\plouf\AppData\Local\Temp\android867514671559174877sketch\bin\classes.dex...

BUILD FAILED
C:\Users\plouf\Documents\modes\AndroidMode\sdk\tools\ant\build.xml:888: The following error occurred while executing this line:
C:\Users\plouf\Documents\modes\AndroidMode\sdk\tools\ant\build.xml:890: The following error occurred while executing this line:
C:\Users\plouf\Documents\modes\AndroidMode\sdk\tools\ant\build.xml:902: The following error occurred while executing this line:
C:\Users\plouf\Documents\modes\AndroidMode\sdk\tools\ant\build.xml:283: null returned: -1073740791

here's my simple sketch:

import ketai.ui.*;
import oscP5.*;
import netP5.*;
import jcifs.smb.NtlmPasswordAuthentication;
import jcifs.smb.SmbFile;
import jcifs.smb.SmbFileOutputStream;

float rouge=random(255);
float vert=random(255);
float bleu=random(255);
void setup()
{
  fullScreen();
  background(rouge, vert, bleu);
}

void draw()

{
  background(rouge, vert, bleu);
}

void mousePressed()
{
  rouge=random(255);
  bleu=random(255);
  vert=random(255);
}
/*
can compile:


 import jcifs.smb.NtlmPasswordAuthentication;
 import jcifs.smb.SmbFile;
 import jcifs.smb.SmbFileOutputStream;
 import netP5.*;
 import oscP5.*;
 ************************************************
  ketai.ui.* alone
 *************************************************
  */

thanks in advance !!!